Games like Anomaly
Games like Anomaly include Escape the Backrooms, Five Nights at Freddy's: Security Breach, The Outlast Trials, Lethal Company, and SILENT HILL: Townfall. We matched them by the tags players give Anomaly on Steam (Horror, Psychological Horror, Colorful, Mystery, and Action): closest matches first, and among equally close ones the better-known games.

Escape the Backrooms
Shared: Horror · Psychological Horror · Adventure

Five Nights at Freddy's: Security Breach
Shared: Horror · Stealth · Action

The Outlast Trials
Shared: Horror · Psychological Horror · Action

Lethal Company
Shared: Horror · Psychological Horror · Exploration

SILENT HILL: Townfall
Shared: Horror · Psychological Horror · Action

Five Nights at Freddy's: Secret of the Mimic
Shared: Horror · Action · Adventure

Poppy Playtime
Shared: Horror · Psychological Horror · Mystery

Outlast
Shared: Horror · Psychological Horror · First-Person

Phasmophobia
Shared: Horror · Psychological Horror · Mystery

Hello Neighbor 2
Shared: Horror · Adventure · Colorful

Maid of Sker
Shared: Horror · Action · Psychological Horror

Little Nightmares II
Shared: Horror · Psychological Horror · Adventure

Firewatch
Shared: Adventure · Mystery · Horror

Darkwood
Shared: Horror · Psychological Horror · Action

Amnesia: Rebirth
Shared: Horror · Action-Adventure · Adventure

Zort
Shared: Horror · Psychological Horror · Action

Outer Wilds
Shared: Mystery · Adventure · Exploration

Pacify
Shared: Horror · Psychological Horror · Exploration

Inside the Backrooms
Shared: Horror · Psychological Horror · Adventure

SILENT HILL f
Shared: Horror · Psychological Horror · Action

MiSide
Shared: Psychological Horror · Horror · First-Person

SOMA
Shared: Horror · Psychological Horror · Exploration

Amnesia: A Machine For Pigs
Shared: Horror · Psychological Horror · Mystery

The Beast Inside
Shared: Horror · Adventure · Psychological Horror