Games like All Hallows
Games like All Hallows include Layers of Fear (2016), Escape the Backrooms, The Complex: Expedition, Backrooms: Escape Together, and Subliminal. We matched them by the tags players give All Hallows on Steam (Music-Based Procedural Generation, Psychological Horror, Horror, Realistic, and Exploration): closest matches first, and among equally close ones the better-known games.

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

Escape the Backrooms
Shared: Horror · Psychological Horror · Exploration

The Complex: Expedition
Shared: Horror · Realistic · Psychological Horror

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

Subliminal
Shared: Psychological Horror · Realistic · Horror

SOMA
Shared: Psychological Horror · Horror · Atmospheric

Ready or Not
Shared: Realistic · Horror · Psychological Horror

Outlast
Shared: Horror · Psychological Horror · Atmospheric

Darkwood
Shared: Horror · Psychological Horror · Action

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

Little Nightmares II
Shared: Horror · Psychological Horror · Singleplayer

Firewatch
Shared: Atmospheric · Adventure · Exploration

Outer Wilds
Shared: Exploration · Atmospheric · Adventure

SILENT HILL 2
Shared: Psychological Horror · Horror · Atmospheric

Poppy Playtime
Shared: Horror · Psychological Horror · Singleplayer

Fears to Fathom - Ironbark Lookout
Shared: Psychological Horror · Horror · Atmospheric

Lethal Company
Shared: Horror · Psychological Horror · Exploration

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

DREDGE
Shared: Exploration · Psychological Horror · Atmospheric

MiSide
Shared: Psychological Horror · Horror · Atmospheric

Five Nights at Freddy's: Security Breach
Shared: Horror · Singleplayer · Exploration

What Remains of Edith Finch
Shared: Atmospheric · Exploration · Psychological Horror

In Sound Mind
Shared: Psychological Horror · Horror · Atmospheric

Total Chaos
Shared: Psychological Horror · Horror · Action