Games like Anomaly Observer
Games like Anomaly Observer include The Exit 8, Lethal Company, Platform 8, Inside the Backrooms, and Who's Lila?. We matched them by the tags players give Anomaly Observer on Steam (Psychological Horror, Exploration, Horror, Surreal, and Hidden Object): closest matches first, and among equally close ones the better-known games.

The Exit 8
Shared: Exploration · Horror · Psychological Horror

Lethal Company
Shared: Horror · Exploration · Psychological Horror

Platform 8
Shared: Psychological Horror · Exploration · Hidden Object

Inside the Backrooms
Shared: Horror · Psychological Horror · Puzzle

Who's Lila?
Shared: Psychological Horror · Horror · Exploration

Escape the Backrooms
Shared: Horror · Psychological Horror · Exploration

CAPTURED
Shared: Psychological Horror · Horror · Exploration

Endacopia
Shared: Psychological Horror · Horror · Surreal

Phasmophobia
Shared: Horror · Psychological Horror · Detective

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

SOMA
Shared: Psychological Horror · Horror · Exploration

MiSide
Shared: Psychological Horror · Horror · Puzzle

ESCAPE FROM BOYKISSER
Shared: Psychological Horror · Surreal · Horror

Poppy Playtime
Shared: Horror · Psychological Horror · Puzzle

MOLE
Shared: Horror · Psychological Horror · Exploration

Detention
Shared: Psychological Horror · Horror · Puzzle

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

Scanner Sombre
Shared: Exploration · Horror · Psychological Horror

CloverPit
Shared: Psychological Horror · Horror · Roguelite

Pacify
Shared: Horror · Psychological Horror · Exploration

Mouthwashing
Shared: Psychological Horror · Horror · Surreal

True Fear: Forsaken Souls Part 1
Shared: Exploration · Horror · Psychological Horror

Garten of Banban
Shared: Horror · Psychological Horror · Puzzle

Fran Bow
Shared: Psychological Horror · Horror · Puzzle