Games like Blanket Fort
Games like Blanket Fort include Poppy Playtime, Outlast, SOMA, ROUTINE, and Amnesia: The Dark Descent. We matched them by the tags players give Blanket Fort on Steam (Horror, Psychological Horror, Cozy, Survival Horror, and Singleplayer): closest matches first, and among equally close ones the better-known games.

Poppy Playtime
Shared: Horror · Singleplayer · Survival Horror

Outlast
Shared: Horror · Survival Horror · Psychological Horror

SOMA
Shared: Horror · Psychological Horror · Survival Horror

ROUTINE
Shared: Psychological Horror · Singleplayer · Horror

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

Escape the Backrooms
Shared: Horror · Psychological Horror · Survival Horror

Outlast 2
Shared: Horror · Psychological Horror · Survival Horror

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

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

Visage
Shared: Horror · Psychological Horror · Survival Horror

Little Nightmares
Shared: Horror · Singleplayer · Adventure

Inside the Backrooms
Shared: Horror · Survival Horror · Psychological Horror

Lethal Company
Shared: Horror · Survival Horror · Psychological Horror

Little Nightmares II
Shared: Horror · Singleplayer · Psychological Horror

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

Garten of Banban
Shared: Horror · Psychological Horror · Singleplayer

Five Nights at Freddy's: Security Breach
Shared: Horror · Survival Horror · Singleplayer

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

Slender: The Arrival
Shared: Horror · Survival Horror · Psychological Horror

Backrooms: Escape Together
Shared: Horror · Psychological Horror · Survival Horror

MiSide
Shared: Psychological Horror · Horror · Singleplayer

Bendy and the Ink Machine
Shared: Horror · Singleplayer · Survival Horror

Darkwood
Shared: Horror · Psychological Horror · Survival Horror

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