Games like Psychosis
Games like Psychosis include Poppy Playtime, In Sound Mind, Ready or Not, METRO 2033 Redux, and Inside the Backrooms. We matched them by the tags players give Psychosis on Steam (Psychological Horror, FPS, Puzzle, Atmospheric, and Surreal): closest matches first, and among equally close ones the better-known games.

Poppy Playtime
Shared: Puzzle · Psychological Horror · Horror

In Sound Mind
Shared: Psychological Horror · Puzzle · Atmospheric

Ready or Not
Shared: FPS · Shooter · Psychological Horror

METRO 2033 Redux
Shared: FPS · Atmospheric · Horror

Inside the Backrooms
Shared: Psychological Horror · Puzzle · Horror

Cruelty Squad
Shared: FPS · Psychological Horror · Surreal

Garten of Banban
Shared: Psychological Horror · Puzzle · Horror

Firework
Shared: Puzzle · Psychological Horror · Atmospheric

HOLE
Shared: FPS · Psychological Horror · Surreal

METRO Last Light Redux
Shared: FPS · Atmospheric · Horror

DOOM
Shared: FPS · Shooter · First-Person

Phasmophobia
Shared: Psychological Horror · Horror · First-Person

Lost in Vivo
Shared: Psychological Horror · Atmospheric · FPS

Metro Exodus
Shared: FPS · Atmospheric · First-Person

Black Mesa
Shared: FPS · Atmospheric · First-Person

Amnesia: The Dark Descent
Shared: Psychological Horror · Atmospheric · Puzzle

Outlast
Shared: Psychological Horror · Atmospheric · First-Person

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

The Room Two
Shared: Puzzle · Atmospheric · Mystery

Half-Life: Alyx
Shared: FPS · Shooter · Horror

Layers of Fear (2016)
Shared: Psychological Horror · Atmospheric · Horror

Cube Escape Collection
Shared: Puzzle · Psychological Horror · Mystery

Receiver 2
Shared: FPS · Atmospheric · Psychological Horror