Games like Grimm 1865
Games like Grimm 1865 include Poppy Playtime, Dark Deception, Ultimate Custom Night, Outlast, and Aimlabs. We matched them by the tags players give Grimm 1865 on Steam (Free to Play, Indie, Action, Adventure, and Horror): closest matches first, and among equally close ones the better-known games.

Poppy Playtime
Shared: Free to Play · Horror · First-Person

Dark Deception
Shared: Free to Play · Horror · First-Person

Ultimate Custom Night
Shared: Free to Play · Horror · First-Person

Outlast
Shared: Horror · First-Person · Atmospheric

Aimlabs
Shared: Free to Play · Action · First-Person

Apex Legends™
Shared: Free to Play · Action · First-Person

The Forest
Shared: Horror · Adventure · Action

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

Bendy and the Dark Revival
Shared: Horror · Action · First-Person

The Beast Inside
Shared: Adventure · Horror · Action

Lethal Company
Shared: Horror · First-Person · Indie

We Were Here
Shared: Free to Play · Horror · Adventure

We Happy Few
Shared: Adventure · Action · Indie

The Hat Man: Shadow Ward
Shared: Indie · Horror · Adventure

Spooky's Jump Scare Mansion: HD Renovation
Shared: Indie · Horror · Adventure

Dark Fracture: Prologue
Shared: Adventure · Horror · Indie

Firewatch
Shared: Adventure · Atmospheric · First-Person

Halo Infinite
Shared: Free to Play · Action · First-Person

Among the Sleep - Enhanced Edition
Shared: Indie · Horror · Adventure

Backrooms: Escape Together
Shared: Horror · Atmospheric · First-Person

Samsara Room
Shared: Indie · Free to Play · Adventure

Penumbra Overture
Shared: Adventure · Horror · Indie

Zort
Shared: Horror · First-Person · Action

Despair
Shared: Indie · Action · Horror