This is not an exhaustive list, just my recommendations.

Furiko Film
3 min
The House of Small Cubes Film
12 min
The House of Small Cubes (MyAnimeList)
Little Witch Academia Film
26 min
Little Witch Academia (MyAnimeList)
Moses Supposes Film
2 min
Space Patrol Luluco Series
7 min x 13 eps

Though its not necessary, watching specific shows before watching Space Patrol Luluco can enhance the experience. The shows being Kill la Kill, Inferno Cop, Little Witch Academia, and SEX&VIOLENCE with MACHSPEED (Episode 14 of the Japanese Animator Expo)

Tonari no Seki-kun Series
7 min x 21 eps
Mizu no Kotoba Film
9 min
Honobono Log Series
2 min x 10 eps
Honobono Log (MyAnimeList)
Shashinkan Film
16 min
Shashinkan (MyAnimeList)
Kanamewo Arthouse Music video
5 min
Japan Animator Expo Anthology Film Music video
7 min x 35 eps
Japan Animator Expo (MyAnimeList)
Konohana no Sakuya Mori Arthouse
11 min
Konohana no Sakuya Mori (MyAnimeList)
Southpaw Arthouse Music video
1 min
Growth Factor Film
6 min
Growth Factor (Vimeo)
Inaka Isha Arthouse
21 min
Inaka Isha (MyAnimeList)
Dareka no Manazashi Film
6 min
Dareka no Manazashi (MyAnimeList)
Yodomi no Sakagi Arthouse
10 min
She and Her Cat: Everything Flows Series
7 min x 4 eps
Tatakau Mono-tachi e Ai wo Komete Music video
5 min
The Ballad of Suicide Music video
4 min
Rain Town Music video
10 min
Batman: Gotham Knight Anthology Film
12 min x 6 eps
Batman: Gotham Knight (MyAnimeList)
Blade Runner: Black Out 2022 Film
15 min
Shiranpuri Film
24 min
Shiranpuri (MyAnimeList)
A Piece of Phantasmagoria Arthouse Series
5 min x 15 eps
A Piece of Phantasmagoria (MyAnimeList)
Airy Me Arthouse Music video
5 min
I Can't Understand What My Husband Is Saying Series
3 min x 13 eps
Cencoroll Film
26 min
Cencoroll (MyAnimeList)
Koko ni Iru Film
2 min
Koko ni Iru (MyAnimeList)
00:08 Arthouse
5 min
Crazy for It Arthouse
3 min
Otona Joshi no Anime Time Anthology Film
25 min x 4 eps
Otona Joshi no Anime Time (MyAnimeList)
Shelter Music video
6 min
Aiura Series
4 min x 12 eps
Anemone Arthouse
5 min
The Diary of Tortov Riddle Arthouse Series
3 min x 6 eps
The Diary of Tortov Riddle (MyAnimeList)
There She Is! Series
5 min x 5 eps
playground Film
5 min
Death Billiards Film
25 min
Death Billiards (MyAnimeList)

Death Billiards was released prior to (and is what led to the creation of) Death Parade. You can watch it before or after Death Parade.

A Gum Boy Arthouse
3 min
Ryoutei no Aji Commercial
1 min x ? eps
Nerenai!!! Arthouse Music video
5 min
L’Œil du Cyclone Arthouse
4 min
The TV Show Music video
3 min
Twilight Q Anthology Film
30 min x 2 eps
Twilight Q (MyAnimeList)
COPY Arthouse
1 min
A Branch of a Pine Is Tied Up Arthouse
16 min
A Branch of a Pine Is Tied Up (MyAnimeList)
Worku Arthouse
11 min x 2 eps
Wonder Arthouse
8 min
Wonder (MyAnimeList)
Life no Color Arthouse
4 min
Life no Color (MyAnimeList)
Hotohashiru Music video
4 min
Golden Time Film
21 min
Aitata Bocchi Arthouse
11 min
Daicon Opening Animations Series
5 min x 2 eps
Daicon Opening Animations (MyAnimeList)
Mitsuami no Kamisama Film
28 min
Mitsuami no Kamisama (MyAnimeList)
Tonkatsu DJ Agetarou Series
9 min x 12 eps
Manie-Manie: Meikyuu Monogatari Anthology Film
16 min x 3 eps
Manie-Manie: Meikyuu Monogatari (MyAnimeList)
Scutes on my mind Arthouse
9 min
On Your Mark Music video
6 min
On Your Mark (MyAnimeList)
Girl Electric Music video
2 min
Way back to the Sea Arthouse
9 min
Way back to the Sea (Youtube)
Kaijuu Music video
1 min
Samurai Noodles: The Originator Commercial
1 min
Pale Cocoon Film
23 min
Pale Cocoon (MyAnimeList)
She and Her Cat Film
4 min
She and Her Cat (MyAnimeList)
Red Ash: Gearworld Film
23 min
Red Ash: Gearworld (MyAnimeList)
Kicking Rocks Arthouse
5 min
Monotonous Purgatory Arthouse Music video
6 min
Ya-Ne-Sen a Go Go Arthouse
1 min
Nihonbashi Koukashita R Keikaku Film
1 min
Ikezu Music video
51 sec
Totsukuni no Shoujo Film
10 min
Totsukuni no Shoujo (MyAnimeList)
Roto Spread Arthouse
1 min
Muybridge's Strings Arthouse
13 min
Muybridge's Strings (MyAnimeList)
Feeling from Mountain and Water Arthouse
20 min
Feeling from Mountain and Water (MyAnimeList)
Kyou no Asuka Show Series
3 min x 20 eps
Kyou no Asuka Show (MyAnimeList)
shake Arthouse Music video
4 min
Kanojo wa Zombie Music video
3 min
Kanojo wa Zombie (MyAnimeList)
Ningyo Film
8 min
Ningyo (MyAnimeList)
Anima Arthouse
4 min
The Old Crocodile Film
13 min
Oshiete! Galko-chan Series
7 min x 12 eps
Kujira no Chouyaku Arthouse
22 min
Kujira no Chouyaku (MyAnimeList)
And And Arthouse
6 min
And And (MyAnimeList)
Land Arthouse
3 min
Ojisan no Lamp Film
24 min
Ojisan no Lamp (MyAnimeList)
Een Arthouse
1 min
Tokyo Cosmo Film
4 min
Chuumon no Ooi Ryouriten (1991) Arthouse
19 min
Chuumon no Ooi Ryouriten (1991) (MyAnimeList)
Wasurenagumo Film
25 min
Wasurenagumo (MyAnimeList)
Isu Arthouse
10 min
Isu (MyAnimeList)
HenSemi Series
12 min x 13 eps
HenSemi (MyAnimeList)
Korekuraide Utau Music video
6 min
Harmonie Film
25 min
Harmonie (MyAnimeList)
Anime Tenchou Commercial
2 min
Anime Tenchou (MyAnimeList)
Dance, Dance, Dance Music video
4 min
Bokura Mada Underground Music video
5 min
Hi no Youjin Film
12 min
Hi no Youjin (MyAnimeList)
Toyoichi Arthouse Music video
3 min
Thermae Romae Series
12 min x 5 eps
Thermae Romae (MyAnimeList)
loTus feat. Pt. Ajay Pohankar Arthouse Music video
4 min
May Film
3 min
Atama Yama Arthouse
10 min
Higashi Asia Bunka Toshi 2019 Toshima Film
1 min
Egao Music video
2 min
Egao (MyAnimeList)
DušaN Music video
3 min
Please Take My Brother Away Series
3 min x 12 eps
Please Take My Brother Away (MyAnimeList)
Mudai (Untitled) Film
7 min
Mudai (Untitled) (MyAnimeList)
Universe Music video
4 min
Universe (MyAnimeList)
White Fantasy Commercial
2 min
White Fantasy (MyAnimeList)
Birthday Boy Film
10 min
Birthday Boy (MyAnimeList)
Chainsaw Bunny Arthouse
6 min
Made in Japan Film
2 min
Made in Japan (MyAnimeList)
Iblard Jikan Film
30 min
Iblard Jikan (MyAnimeList)
Nowhereland Arthouse Music video
3 min
Nowhereland (MyAnimeList)
Norageki Film
24 min
Norageki (MyAnimeList)
Wasure-boshi Arthouse
5 min
Wasure-boshi (MyAnimeList)
Akuma no Kimuraa-hen Commercial
30 sec
fake!fake! Music video
3 min
Timeless Music video
4 min
Kyoto Animation Commercials Commercial
30 sec x 9 eps

MAL Links are ordered in chronological order, as is the playlist.

Onboro Film Film
5 min
Onboro Film (MyAnimeList)
Susume, Karolina. Film
3 min
Kono Danshi, Ningyo Hiroimashita. Film
28 min
Kick-Heart Film
12 min
Kick-Heart (MyAnimeList)
Aki no Kanade Film
25 min
Aki no Kanade (MyAnimeList)
Calm Arthouse
7 min
Kingsglaive: FFXV Fan Kansha Tokubetsu Movie Commercial
1 min
Such a Good Place to Die Arthouse
3 min
Crystal Clear Music video
4 min
The Cockpit Anthology Film
23 min x 3 eps
The Cockpit (MyAnimeList)
Kobutori (1929) Film
10 min
Kobutori (1929) (MyAnimeList)
Yama no Susume Series
3 min x 12 eps
Yama no Susume (MyAnimeList)
Sweat Punch Anthology Arthouse
11 min x 5 eps
Sweat Punch (MyAnimeList)
Oki ni Mesu mama Music video
4 min
Master Blaster Arthouse
3 min
Master Blaster (MyAnimeList)
Mogu & Perol Film
8 min
Onkyo Seimeitai Noiseman Film
15 min
Onkyo Seimeitai Noiseman (MyAnimeList)
Himitsu Spark Music video
3 min
New Yoku feat. Chan-Mika Music video
4 min
METROID Short Animation Film
54 sec
a reflection of one's mind Film
5 min
a reflection of one's mind (Youtube)
Kono Danshi, Mahou ga Oshigoto Desu. Series
7 min x 4 eps
little heart Film
5 min
little heart (Youtube)
Robotica * Robotics Film
10 min
Robotica * Robotics (MyAnimeList)
Through the Windows Arthouse
3 min
The Legend of Shangri-La Film
14 min
The Legend of Shangri-La (MyAnimeList)
lilac (bombs Jun Togawa) Arthouse Music video
4 min
Clover Film
6 min
Clover (MyAnimeList)
Poulette no Isu Film
3 min
Poulette no Isu (MyAnimeList)
Senyuu. Series
4 min x 13 eps
Je T'aime Film
11 min
Je T'aime (MyAnimeList)
Push Film
4 min
Push (MyAnimeList)
Cornelis Arthouse
4 min
Tailenders Film
27 min
Tailenders (MyAnimeList)
Moving Colors Arthouse
5 min
Transfer Music video
6 min
Robber's Company Series
5 min x 6 eps
Hashi no Mukou Film
10 min
663114 Arthouse
7 min
663114 (MyAnimeList)
Super Seisyun Brothers Series
4 min x 14 eps
Super Seisyun Brothers (MyAnimeList)
Memory (ONA) Film
7 min
Buta Film
24 min
Buta (MyAnimeList)
Cross Road Film
2 min
Cross Road (MyAnimeList)
Piece Music video
5 min
Piece (MyAnimeList)
Cromartie High School Series
12 min x 26 eps
VIEW Arthouse
3 min
VIEW (Youtube)
Fuyu no Hi Anthology Arthouse
1 min x 36 eps
Fuyu no Hi (MyAnimeList)
Age of Obscure: Boubaku Jidai Arthouse
3 min
Age of Obscure: Boubaku Jidai (Vimeo)
Yasashii March Music video
3 min
Koitabi: True Tours Nanto Series
7 min x 6 eps
Koitabi: True Tours Nanto (MyAnimeList)
Tengoku Music video
3 min
Towel Story Series
2 min x 4 eps
The Starry Night Music video
4 min
Tenuto Music video
4 min
Survival Arthouse
4 min
Ai Monogatari: 9 Love Stories Anthology Film
10 min x 9 eps
Ai Monogatari: 9 Love Stories (MyAnimeList)
Konoha Kaseki no Natsu Film
11 min
Yuureisen Film
11 min
Yuureisen (MyAnimeList)
Petting a Dog Arthouse
16 sec
Murder Film
10 min
Murder (MyAnimeList)
Oruchuban Ebichu Series
8 min x 24 eps
Oruchuban Ebichu (MyAnimeList)
Hana wa Saku Music video
4 min
Don't leave me Arthouse
2 min
Don't leave me (Youtube)
Water Brain Film
14 min
Mori no Densetsu: Dai Ni Gakushou Film
11 min
Mori no Densetsu: Dai Ni Gakushou (MyAnimeList)

Listed as a sequel on MAL, but it's only in spirit.

48x61 Film
6 min
48x61 (MyAnimeList)
Kid's Castle Film
4 min
Muramasa Film
8 min
Muramasa (MyAnimeList)
Jumping Film
6 min
Jumping (MyAnimeList)
Two Tea Two Arthouse
3 min
Love In Ruins Music video
3 min
Halfway Music video
5 min
Saiki Kusuo no Ψ-nan Series
5 min x 120 eps
Korekarasaki, Nando Anata to. Music video
4 min
Korekarasaki, Nando Anata to. (MyAnimeList)
Tsuki no Waltz Music video
5 min
Tsuki no Waltz (MyAnimeList)
Lupin III 3DCG Film
2 min
Lupin III 3DCG (MyAnimeList)
Arara Arthouse
1 min
Sect Music video
4 min
Momokuri Series
12 min x 26 eps
Choujuu Giga Series
31 sec x 3 eps
Chi's Sweet Home Series
3 min x 104 eps
Chi's Sweet Home (MyAnimeList)
Around Arthouse
3 min
Obake no Dokurou Film
11 min
Kitsune Tsuki Arthouse
7 min
Inferno Cop Series
3 min x 13 eps
Go! Samurai Film
6 min
Wakaranai Buta Arthouse
10 min
Dededen Series
1 min x 5 eps
SAI: Part 1 / Revolving... to the Core Arthouse
15 min
SAI: Part 1 / Revolving... to the Core (MyAnimeList)
Hungry Days: Aoharu ka yo Commercial Series
30 sec x 6 eps
Baa-cha no Kingyo Film
8 min
Onikiri Musume Saisen Film
1 min
Kotatsu Neko (ONA) Series
1 min x 2 eps
Kanabun no Koushin Arthouse
4 min
Woman Who Stole Fingers Arthouse
4 min
Grim Arthouse
7 min
Grim (MyAnimeList)
Nakedyouth Arthouse
9 min
Nakedyouth (MyAnimeList)
Tabisuru Nuigurumi: Traveling Daru Film
10 min
Tabisuru Nuigurumi: Traveling Daru (MyAnimeList)
Taneyamagahara no Yoru Film
27 min
Taneyamagahara no Yoru (MyAnimeList)
Robot Carnival Anthology Film
10 min x 9 eps
Robot Carnival (MyAnimeList)
Baja no Studio Film
21 min
Baja no Studio (MyAnimeList)
Aimai Elegy Music video
3 min
The Animatrix Anthology Film
10 min x 9 eps
The Animatrix (MyAnimeList)
Kudan Film
9 min
Kudan (MyAnimeList)
Kaze no Matasaburou Film
22 min
Kaze no Matasaburou (MyAnimeList)
Kono Danshi, Uchuujin to Tatakeamasu Film
28 min
Jack Nicholson Music video
4 min
Hairy Tale Commercial
1 min
Hairy Tale (MyAnimeList)
Orchestra Arthouse
6 min
Coffee Break Arthouse
3 min
Coffee Break (MyAnimeList)
Koukou Arthouse
6 min
Sexy Commando Gaiden: Sugoiyo!! Masaru-san Series
8 min x 48 eps
Sexy Commando Gaiden: Sugoiyo!! Masaru-san (MyAnimeList)
The Ruined Planet Film
1 min
The Ruined Planet (Youtube)
Koi Sento Film
25 min
Koi Sento (MyAnimeList)
Fumiko no Kokuhaku Film
2 min
Fumiko no Kokuhaku (MyAnimeList)
Cockroach Calisthenics Film
15 sec
Cockroach Calisthenics (MyAnimeList)
Blossom Music video
5 min
Tentai Senshi Sunred Series
13 min x 26 eps
Tentai Senshi Sunred (MyAnimeList)
Rinkaku Arthouse Music video
6 min
Rinkaku (MyAnimeList)
Kizuna Ichigeki Film
24 min
Kizuna Ichigeki (MyAnimeList)
Children Arthouse
4 min
Nameless Flipbook Arthouse
2 min
Genius Party Anthology Film
14 min x 7 eps
Genius Party (MyAnimeList)
Genius Party Beyond Anthology Film
15 min x 5 eps
Genius Party Beyond (MyAnimeList)
Aggressive Retsuko Series
1 min x 100 eps
Aggressive Retsuko (MyAnimeList)
Chiruri Arthouse Film
8 min
Atarashii Sekai Music video
3 min
Atarashii Sekai (MyAnimeList)
Tadaima. Music video
3 min
Koi Tsubomi Music video
2 min
Koi Tsubomi (MyAnimeList)
Kakurenbo Film
25 min
Kakurenbo (MyAnimeList)
Rec Series
13 min x 9 eps
Rec (MyAnimeList)
Cluster A Film
3 min
Akai Ito Film
4 min
Mahou Shoujo-tai Arusu Series
9 min x 40 eps
Mahou Shoujo-tai Arusu (MyAnimeList)
Hoshi no Shita, Shonen no Hi Film
3 min
Hoshi no Shita, Shonen no Hi (Youtube)
Tooi Sekai Arthouse
1 min
Tooi Sekai (MyAnimeList)
Maku Arthouse
5 min
Maku (MyAnimeList)
Rumiko Takahashi Anthology Anthology Film
25 min x 13 eps
Rumiko Takahashi Anthology (MyAnimeList)
Buki yo Saraba Film
25 min
Buki yo Saraba (MyAnimeList)
Yami Shibai Series
4 min x 13 eps

I only recommend the first season of Yami Shibai. The rest of the seasons don't retain the unique horror feeling.

Birthday Arthouse
1 min
Chisato Was Only Gazing Arthouse
5 min
KUROKO Film
4 min
KUROKO (Youtube)
Ookami Heart Music video Series
3 min x 2 eps
Ojisan to Marshmallow Series
3 min x 12 eps
Tokyo Loop Anthology Arthouse
4 min x 16 eps
Tokyo Loop (MyAnimeList)
Jin Sheng Yuan Music video
5 min
Jin Sheng Yuan (MyAnimeList)
Omoi no Kakera Film
24 min
Omoi no Kakera (MyAnimeList)
Tonari no Yarou Arthouse
9 min
Tonari no Yarou (MyAnimeList)
Yondemasu yo, Azazel-san. Series
12 min x 13 eps
Kura Sushi Commercial Series
3 min x 2 eps
Super Kuma-san Film
20 min
Super Kuma-san (MyAnimeList)
Minion Music video
2 min x 3 eps
Fireball Series
1 min x 13 eps
Fireball (MyAnimeList)
Mirai no Watashi Commercial
1 min x ? eps
Mirai no Watashi (MyAnimeList)
Kowarekake no Orgel Film
28 min
Kowarekake no Orgel (MyAnimeList)
Parol no Miraijima Film
26 min
Parol no Miraijima (MyAnimeList)
Binchou-tan Series
12 min x 12 eps
Binchou-tan (MyAnimeList)
Ontama! Series
11 min x 5 eps
Ontama! (MyAnimeList)
Memory Film
5 min
Memory (MyAnimeList)
Ame to Shoujo to Watashi no Tegami Film
6 min
Ame to Shoujo to Watashi no Tegami (MyAnimeList)
Heya/Keitai Arthouse
6 min
Heya/Keitai (MyAnimeList)
Controller of Controller Film
7 min
1001 Nights Arthouse
24 min
1001 Nights (MyAnimeList)
Pukapuka Juju Film
24 min
Pukapuka Juju (MyAnimeList)
Pet-etre toi Music video
4 min
Pet-etre toi (MyAnimeList)
Bouen no March Music video
4 min
Fluximation Anthology Music video
1 min x 14 eps
Fluximation (MyAnimeList)
Pupipo! Series
4 min x 15 eps
Pupipo! (MyAnimeList)
Amanatsu Film
14 min
Galo Sengen Music video
3 min
Teekyuu Series
2 min x 12 eps
Teekyuu (MyAnimeList)
Children Arthouse
4 min
Hoshi no Koe Film
25 min
Hoshi no Koe (MyAnimeList)
Takane no Jitensha Film
24 min
Takane no Jitensha (MyAnimeList)
Plastic Neesan Series
2 min x 12 eps
Plastic Neesan (MyAnimeList)
Tansu Warashi. Film
23 min
Tansu Warashi. (MyAnimeList)
Yuri Seijin Naoko-san (2012) Film
28 min
Yuri Seijin Naoko-san (2012) (MyAnimeList)
the HIATUS Arthouse
3 min
the HIATUS (Youtube)
Visions of Frank Anthology Arthouse
5 min x 9 eps
Visions of Frank (MyAnimeList)
Attraction Film
10 min

Attraction is a interactive commercial. In it, you watch clips of anime, and then have to use either a webcam or just your mouse to advance the 'story'. You must enable Flash on the website; it doesn't ask. If you don't have Flash enabled by default on the website, it'll seem like theres no video there.

Halo Legends Anthology Film
16 min x 9 eps
Halo Legends (MyAnimeList)
Ainone Music video
1 min
Amazing Nuts! Film
10 min x 4 eps
Amazing Nuts! (MyAnimeList)
Yume de Aetara Series
7 min x 16 eps
Yume de Aetara (MyAnimeList)
Ani*Kuri15 Anthology Arthouse
1 min x 15 eps
Ani*Kuri15 (MyAnimeList)
Sister Music video
4 min
Yumedamaya Kidan Film
24 min
Yumedamaya Kidan (MyAnimeList)
Aftermath Music video
5 min
Sekiranun Grafitti Music video
3 min
Taifuu no Noruda Film
26 min
Taifuu no Noruda (MyAnimeList)
Digital Juice Anthology Arthouse
3 min x 6 eps
Digital Juice (MyAnimeList)
Perfect Day Music video
4 min
Perfect Day (MyAnimeList)
The Four Seasons Anthology Film
8 min x 4 eps
The Four Seasons (MyAnimeList)
Last Orders Commercial
1 min
Last Orders (MyAnimeList)
Hana no Kage Film
7 min x 2 eps