Games like The Anomalous Hour
Games like The Anomalous Hour include Amnesia: A Machine For Pigs, Five Nights at Freddy's: Security Breach, Firewatch, Killer Frequency, and Scanner Sombre. We matched them by the tags players give The Anomalous Hour on Steam (Horror, Exploration, Multiple Endings, Hidden Object, and Interactive Fiction): closest matches first, and among equally close ones the better-known games.

Amnesia: A Machine For Pigs
Shared: Horror · Exploration · Walking Simulator

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

Firewatch
Shared: Exploration · Walking Simulator · First-Person

Killer Frequency
Shared: Horror · Interactive Fiction · Exploration

Scanner Sombre
Shared: Exploration · Horror · Walking Simulator

The Exit 8
Shared: Exploration · Horror · Walking Simulator

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

Dollmare
Shared: Horror · 3D · Multiple Endings

Phasmophobia
Shared: Horror · Psychological Horror · Investigation

Platform 8
Shared: Exploration · Hidden Object · Walking Simulator

The Painscreek Killings
Shared: Exploration · Investigation · Horror

Lethal Company
Shared: Horror · Exploration · First-Person

Escape the Backrooms
Shared: Horror · Exploration · Psychological Horror

Layers of Fear (2016)
Shared: Horror · Walking Simulator · Psychological Horror

September 7th
Shared: Horror · Exploration · Walking Simulator

Subliminal
Shared: Horror · Psychological Horror · Multiple Endings

Grunn
Shared: Horror · Multiple Endings · Exploration

Psalm 5:9-13
Shared: Horror · Exploration · Psychological Horror

Dreamcore
Shared: Exploration · Horror · Walking Simulator

SOMA
Shared: Horror · Exploration · Psychological Horror

DON'T SCREAM
Shared: Horror · Exploration · Walking Simulator

MiSide
Shared: Horror · Psychological Horror · First-Person

CARIMARA: Beneath the forlorn limbs
Shared: Exploration · Horror · 3D

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