Games like Impostor Syndrom
Games like Impostor Syndrom include Buckshot Roulette, Phasmophobia, Escape the Backrooms, Poppy Playtime, and Outlast. We matched them by the tags players give Impostor Syndrom on Steam (Action, Party Game, 3D, First-Person, and Dark): closest matches first, and among equally close ones the better-known games.

Buckshot Roulette
Shared: Dark · First-Person · Horror

Phasmophobia
Shared: Horror · First-Person · Psychological Horror

Escape the Backrooms
Shared: Horror · First-Person · Psychological Horror

Poppy Playtime
Shared: Horror · First-Person · Dark

Outlast
Shared: First-Person · Horror · Psychological Horror

Pacify
Shared: Horror · First-Person · Psychological Horror

Gorilla Tag
Shared: First-Person · 3D · Psychological Horror

Garten of Banban
Shared: First-Person · Horror · 3D

The Outlast Trials
Shared: Horror · First-Person · Action

Demonologist
Shared: Horror · First-Person · Dark

Counter-Strike 2
Shared: Action · First-Person · PvP

Bendy and the Ink Machine
Shared: First-Person · Horror · Dark

Darkwood
Shared: Action · Horror · Dark

Outlast 2
Shared: First-Person · Horror · Psychological Horror

Inside the Backrooms
Shared: Horror · Psychological Horror · First-Person

Garten of Banban 2
Shared: First-Person · Horror · 3D

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

Liars Bar
Shared: 3D · PvP · First-Person

Garten of Banban 3
Shared: First-Person · Horror · 3D

Slender: The Arrival
Shared: First-Person · Horror · Dark

Garten of Banban 8: Anti Devil
Shared: First-Person · Action · Horror

Resident Evil Requiem
Shared: Action · Horror · First-Person

GONE Fishing
Shared: Action · Horror · First-Person

Grand Theft Auto V Legacy
Shared: Action · First-Person · Adventure