Games like Entombed
Games like Entombed include Outlast, Escape the Backrooms, Poppy Playtime, Garten of Banban, and Five Nights at Freddy's: Security Breach. We matched them by the tags players give Entombed on Steam (Survival Horror, Horror, Psychological Horror, Strategy, and Singleplayer): closest matches first, and among equally close ones the better-known games.

Outlast
Shared: Horror · Survival Horror · Psychological Horror

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

Poppy Playtime
Shared: Horror · Singleplayer · Survival Horror

Garten of Banban
Shared: Horror · Psychological Horror · Singleplayer

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

Lethal Company
Shared: Horror · Survival Horror · Psychological Horror

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

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

SOMA
Shared: Horror · Psychological Horror · Survival Horror

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

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

Outlast 2
Shared: Horror · Survival Horror · Psychological Horror

Ultimate Custom Night
Shared: Horror · Survival Horror · Singleplayer

Five Nights at Freddy's 3
Shared: Horror · Survival Horror · Singleplayer

Garten of Banban 2
Shared: Horror · Singleplayer · Psychological Horror

Pacify
Shared: Horror · Survival Horror · Psychological Horror

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

Darkwood
Shared: Survival Horror · Horror · Psychological Horror

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

Amnesia: The Bunker
Shared: Survival Horror · Horror · Singleplayer

Visage
Shared: Horror · Survival Horror · Psychological Horror

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

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

Garten of Banban 3
Shared: Horror · Psychological Horror · Singleplayer