Games like Steam Prison
Games like Steam Prison include ATRI -My Dear Moments-, Amnesia™: Memories, Magical Girl Witch Trials, 私のリアルは充実しすぎている フルボイス版, and LoveChoice. We matched them by the tags players give Steam Prison on Steam (Visual Novel, Anime, Female Protagonist, Otome, and Romance): closest matches first, and among equally close ones the better-known games.

ATRI -My Dear Moments-
Shared: Visual Novel · Anime · Cute

Amnesia™: Memories
Shared: Visual Novel · Otome · Female Protagonist

Magical Girl Witch Trials
Shared: Visual Novel · Female Protagonist · Cute

私のリアルは充実しすぎている フルボイス版
Shared: Visual Novel · Female Protagonist · Otome

LoveChoice
Shared: Visual Novel · Romance · Story Rich

Senren * Banka
Shared: Visual Novel · Anime · Cute

Volcano Princess
Shared: Female Protagonist · Anime · Visual Novel

CLANNAD
Shared: Visual Novel · Anime · Romance

The Hungry Lamb: Traveling in the Late Ming Dynasty
Shared: Visual Novel · Story Rich · Anime

Hatoful Boyfriend
Shared: Visual Novel · Anime · Female Protagonist

Doki Doki Literature Club Plus!
Shared: Visual Novel · Anime · Cute

Hakuoki: Kyoto Winds
Shared: Visual Novel · Otome · Female Protagonist

My Vow to My Liege
Shared: Female Protagonist · Visual Novel · Otome

STEINS;GATE
Shared: Visual Novel · Anime · Story Rich

Blood Code
Shared: Visual Novel · Female Protagonist · Romance

Far Away
Shared: Visual Novel · Female Protagonist · Anime

Lucy -The Eternity She Wished For-
Shared: Visual Novel · Anime · Romance

Love, Money, Rock'n'Roll
Shared: Visual Novel · Anime · Romance

Mirror 2: Project X
Shared: Anime · Visual Novel · Female Protagonist

Marco & The Galaxy Dragon
Shared: Visual Novel · Anime · Female Protagonist

Florence
Shared: Romance · Female Protagonist · Cute

NEKOPARA Vol. 2
Shared: Anime · Visual Novel · Cute

OZMAFIA!!
Shared: Visual Novel · Otome · Female Protagonist

Danganronpa V3: Killing Harmony
Shared: Visual Novel · Female Protagonist · Anime