Games like KELDER
Games like KELDER include Outlast, Poppy Playtime, Escape the Backrooms, The Beast Inside, and Lethal Company. We matched them by the tags players give KELDER on Steam (Psychological Horror, Survival Horror, Horror, Walking Simulator, and Realistic): closest matches first, and among equally close ones the better-known games.

Outlast
Shared: Horror · Survival Horror · Psychological Horror

Poppy Playtime
Shared: Horror · Survival Horror · Psychological Horror

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

The Beast Inside
Shared: Horror · Survival Horror · Adventure

Lethal Company
Shared: Horror · Survival Horror · Psychological Horror

SOMA
Shared: Psychological Horror · Horror · Survival Horror

Visage
Shared: Psychological Horror · Horror · Survival Horror

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

Outlast 2
Shared: Psychological Horror · Horror · Survival Horror

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

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

Five Nights at Freddy's: Security Breach
Shared: Horror · Survival Horror · First-Person

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

Resident Evil Requiem
Shared: Survival Horror · Horror · Realistic

Firewatch
Shared: Walking Simulator · Adventure · Mystery

Amnesia: A Machine For Pigs
Shared: Horror · Walking Simulator · Psychological Horror

Layers of Fear (2016)
Shared: Psychological Horror · Horror · Walking Simulator

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

Resident Evil Village
Shared: Survival Horror · Horror · First-Person

Mouthwashing
Shared: Psychological Horror · Horror · Walking Simulator

Darkwood
Shared: Survival Horror · Horror · Psychological Horror

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

Fears to Fathom - Ironbark Lookout
Shared: Psychological Horror · Horror · Thriller

Garten of Banban
Shared: Horror · Psychological Horror · Survival Horror