Games like Evil Sinister
Games like Evil Sinister include Poppy Playtime, Outlast, Phasmophobia, Outlast 2, and Darkwood. We matched them by the tags players give Evil Sinister on Steam (Horror, Survival Horror, Psychological Horror, Action, and Demons): closest matches first, and among equally close ones the better-known games.

Poppy Playtime
Shared: Horror · Survival Horror · Psychological Horror

Outlast
Shared: Horror · Survival Horror · Psychological Horror

Phasmophobia
Shared: Horror · Psychological Horror · Supernatural

Outlast 2
Shared: Horror · Survival Horror · Psychological Horror

Darkwood
Shared: Horror · Survival Horror · Psychological Horror

The Outlast Trials
Shared: Horror · Survival Horror · Psychological Horror

Pacify
Shared: Horror · Psychological Horror · Survival Horror

Resident Evil Village
Shared: Horror · Survival Horror · Action

Resident Evil Requiem
Shared: Survival Horror · Horror · Action

Resident Evil 7 Biohazard
Shared: Horror · Survival Horror · Psychological Horror

Visage
Shared: Horror · Survival Horror · Psychological Horror

SOMA
Shared: Horror · Psychological Horror · Survival Horror

Lethal Company
Shared: Horror · Survival Horror · Psychological Horror

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

Escape the Backrooms
Shared: Horror · Psychological Horror · Survival Horror

The Beast Inside
Shared: Horror · Survival Horror · Adventure

Amnesia: The Dark Descent
Shared: Horror · Psychological Horror · Survival Horror

Ultimate Custom Night
Shared: Horror · Survival Horror · Free to Play

Five Nights at Freddy's
Shared: Horror · Survival Horror · Psychological Horror

Dark Deception
Shared: Horror · Psychological Horror · Survival Horror

The Evil Within 2
Shared: Horror · Survival Horror · Psychological Horror

Inside the Backrooms
Shared: Horror · Survival Horror · Psychological Horror

Slender: The Arrival
Shared: Horror · Survival Horror · Psychological Horror

Resident Evil 4
Shared: Horror · Survival Horror · Action