Games like MERROR
Games like MERROR include Poppy Playtime, Buckshot Roulette, SOMA, Garten of Banban, and Amnesia: The Dark Descent. We matched them by the tags players give MERROR on Steam (Singleplayer, Puzzle, Exploration, 3D, and First-Person): closest matches first, and among equally close ones the better-known games.

Poppy Playtime
Shared: Singleplayer · Puzzle · First-Person

Buckshot Roulette
Shared: Singleplayer · Dark · First-Person

SOMA
Shared: Psychological Horror · Exploration · Horror

Garten of Banban
Shared: Singleplayer · First-Person · Puzzle

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

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

Outlast
Shared: First-Person · Singleplayer · Horror

MiSide
Shared: Singleplayer · Psychological Horror · First-Person

The Exit 8
Shared: Puzzle · Exploration · First-Person

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

Inside the Backrooms
Shared: Puzzle · Horror · Exploration

ROUTINE
Shared: Singleplayer · Psychological Horror · Puzzle

Garten of Banban 2
Shared: Singleplayer · Puzzle · First-Person

Little Nightmares II
Shared: Singleplayer · Puzzle · Dark

Five Nights at Freddy's: Security Breach
Shared: Singleplayer · First-Person · Exploration

Outer Wilds
Shared: Exploration · Puzzle · Singleplayer

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

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

Garten of Banban 3
Shared: Singleplayer · Puzzle · First-Person

What Remains of Edith Finch
Shared: Exploration · Singleplayer · First-Person

Amnesia: Rebirth
Shared: Puzzle · Singleplayer · First-Person

Little Nightmares
Shared: Singleplayer · Puzzle · Horror

Fran Bow
Shared: Puzzle · Psychological Horror · Singleplayer

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