Games like Inner
Games like Inner include SOMA, Outlast, Mouthwashing, Outlast 2, and Poppy Playtime. We matched them by the tags players give Inner on Steam (Horror, Psychological Horror, Survival Horror, Retro, and Dark): closest matches first, and among equally close ones the better-known games.

SOMA
Shared: Horror · Psychological Horror · Survival Horror

Outlast
Shared: Horror · Survival Horror · Psychological Horror

Mouthwashing
Shared: Horror · Psychological Horror · Retro

Outlast 2
Shared: Horror · Psychological Horror · Survival Horror

Poppy Playtime
Shared: Horror · Survival Horror · Psychological Horror

Five Nights at Freddy's
Shared: Horror · Survival Horror · Psychological Horror

Five Nights at Freddy's 2
Shared: Horror · Survival Horror · Psychological Horror

No, I'm not a Human
Shared: Horror · Psychological Horror · Singleplayer

Little Nightmares
Shared: Horror · Atmospheric · Dark

The Outlast Trials
Shared: Horror · Survival Horror · Psychological Horror

Ultimate Custom Night
Shared: Horror · Survival Horror · Singleplayer

Darkwood
Shared: Horror · Survival Horror · Psychological Horror

Five Nights at Freddy's 4
Shared: Horror · Survival Horror · Dark

SILENT HILL 2
Shared: Horror · Psychological Horror · Survival Horror

Visage
Shared: Horror · Psychological Horror · Survival Horror

Lethal Company
Shared: Horror · Survival Horror · Psychological Horror

Little Nightmares II
Shared: Horror · Psychological Horror · Dark

Amnesia: The Dark Descent
Shared: Horror · Psychological Horror · Survival Horror

Five Nights at Freddy's: Sister Location
Shared: Horror · Survival Horror · Dark

FAITH: The Unholy Trinity
Shared: Horror · Psychological Horror · Retro

Resident Evil 7 Biohazard
Shared: Horror · Survival Horror · Psychological Horror

Resident Evil Village
Shared: Horror · Survival Horror · Singleplayer

Sally Face - Episode One
Shared: Psychological Horror · Horror · Dark

Garten of Banban
Shared: Horror · Psychological Horror · Singleplayer