Games like Exorcist
Games like Exorcist include Firewatch, MiSide, What Remains of Edith Finch, Ready or Not, and Layers of Fear (2016). We matched them by the tags players give Exorcist on Steam (Adventure, Indie, Singleplayer, Simulation, and Horror): closest matches first, and among equally close ones the better-known games.

Firewatch
Shared: Adventure · Singleplayer · Indie

MiSide
Shared: Psychological Horror · Horror · Singleplayer

What Remains of Edith Finch
Shared: Adventure · Singleplayer · Walking Simulator

Ready or Not
Shared: Singleplayer · Realistic · Horror

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

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

Poppy Playtime
Shared: Singleplayer · Horror · Indie

Mouthwashing
Shared: Horror · Indie · Psychological Horror

No, I'm not a Human
Shared: Indie · Horror · Singleplayer

Subliminal
Shared: Singleplayer · Psychological Horror · Realistic

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

Visage
Shared: Horror · Psychological Horror · Singleplayer

[Chillas Art] The Convenience Store
Shared: Indie · Adventure · Horror

Little Nightmares II
Shared: Adventure · Singleplayer · Horror

Outer Wilds
Shared: Adventure · Exploration · Singleplayer

Little Nightmares
Shared: Adventure · Horror · Singleplayer

Scanner Sombre
Shared: Adventure · Horror · Indie

The Complex: Expedition
Shared: Horror · Singleplayer · Adventure

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

Platform 8
Shared: Adventure · Simulation · Psychological Horror

The Beast Inside
Shared: Adventure · Horror · Singleplayer

Escape the Backrooms
Shared: Horror · Psychological Horror · Adventure

The Park®
Shared: Horror · Singleplayer · Adventure

Blair Witch
Shared: Adventure · Indie · Horror