Games like Anomaly Rooms
Games like Anomaly Rooms include Outlast, Outlast 2, Poppy Playtime, SOMA, and Five Nights at Freddy's. We matched them by the tags players give Anomaly Rooms on Steam (Horror, Survival Horror, Hidden Object, Psychological Horror, and Atmospheric): closest matches first, and among equally close ones the better-known games.

Outlast
Shared: Horror · Survival Horror · Psychological Horror

Outlast 2
Shared: Horror · Survival Horror · Psychological Horror

Poppy Playtime
Shared: Horror · Survival Horror · Psychological Horror

SOMA
Shared: Horror · Psychological Horror · Atmospheric

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

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

Visage
Shared: Horror · Survival Horror · Psychological Horror

No, I'm not a Human
Shared: Horror · Psychological Horror · Choices Matter

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

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

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

Lethal Company
Shared: Horror · Survival Horror · Psychological Horror

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

Layers of Fear (2016)
Shared: Horror · Psychological Horror · Atmospheric

Phasmophobia
Shared: Horror · Psychological Horror · Supernatural

MiSide
Shared: Psychological Horror · Horror · Atmospheric

The Cabin Factory
Shared: Horror · Psychological Horror · Choices Matter

Mouthwashing
Shared: Horror · Psychological Horror · Atmospheric

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

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

From The Darkness
Shared: Horror · Psychological Horror · Survival Horror

Choo-Choo Charles
Shared: Survival Horror · Horror · First-Person

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

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