Games like Devestor
Games like Devestor include Poppy Playtime, Outlast, Resident Evil Village, Resident Evil 7 Biohazard, and Outlast 2. We matched them by the tags players give Devestor on Steam (First-Person, Action, Casual, Horror, and Psychological Horror): closest matches first, and among equally close ones the better-known games.

Poppy Playtime
Shared: Horror · First-Person · Singleplayer

Outlast
Shared: First-Person · Horror · Survival Horror

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

Resident Evil 7 Biohazard
Shared: First-Person · Horror · Survival Horror

Outlast 2
Shared: First-Person · Horror · Psychological Horror

FIVE NIGHTS AT FREDDY'S: HELP WANTED
Shared: Horror · First-Person · Action

Escape the Backrooms
Shared: Horror · First-Person · Psychological Horror

Bendy and the Ink Machine
Shared: First-Person · Horror · Singleplayer

Bendy and the Dark Revival
Shared: First-Person · Horror · Action

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

The Outlast Trials
Shared: Horror · First-Person · Psychological Horror

Garten of Banban
Shared: First-Person · Horror · Psychological Horror

Amnesia: The Dark Descent
Shared: Horror · Psychological Horror · First-Person

Five Nights at Freddy's 4
Shared: First-Person · Horror · Survival Horror

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

Five Nights at Freddy's 2
Shared: Horror · First-Person · Survival Horror

Getting Over It with Bennett Foddy
Shared: Psychological Horror · Horror · Singleplayer

Dark Deception
Shared: Horror · First-Person · Psychological Horror

Buckshot Roulette
Shared: First-Person · Horror · Singleplayer

Ultimate Custom Night
Shared: Horror · First-Person · Singleplayer

Slender: The Arrival
Shared: First-Person · Horror · Survival Horror

Five Nights at Freddy's 3
Shared: Horror · First-Person · Survival Horror

SOMA
Shared: Horror · Psychological Horror · First-Person

Pacify
Shared: Horror · First-Person · Psychological Horror