Games like Quest room
Games like Quest room include The Mortuary Assistant, Phasmophobia, Poppy Playtime, Sally Face - Episode One, and Outlast. We matched them by the tags players give Quest room on Steam (Horror, Supernatural, Mystery, Psychological Horror, and Demons): closest matches first, and among equally close ones the better-known games.

The Mortuary Assistant
Shared: Horror · Supernatural · Mystery

Phasmophobia
Shared: Horror · Psychological Horror · Supernatural

Poppy Playtime
Shared: Horror · Psychological Horror · Mystery

Sally Face - Episode One
Shared: Horror · Psychological Horror · Mystery

Outlast
Shared: Horror · Psychological Horror · Atmospheric

Firework
Shared: Horror · Mystery · Psychological Horror

Mouthwashing
Shared: Horror · Psychological Horror · Atmospheric

Pacify
Shared: Horror · Psychological Horror · Supernatural

What Remains of Edith Finch
Shared: Mystery · Atmospheric · Adventure

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

SOMA
Shared: Horror · Psychological Horror · Atmospheric

Firewatch
Shared: Mystery · Atmospheric · Adventure

Demonologist
Shared: Horror · Psychological Horror · Demons

The Room Two
Shared: Mystery · Horror · Atmospheric

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

Subliminal
Shared: Psychological Horror · Mystery · Horror

Visage
Shared: Horror · Psychological Horror · Dark

Little Nightmares
Shared: Horror · Atmospheric · Adventure

Little Nightmares II
Shared: Horror · Adventure · Psychological Horror

Garten of Banban
Shared: Horror · Psychological Horror · First-Person

Outer Wilds
Shared: Mystery · Adventure · Atmospheric

No one lives under the lighthouse Director's cut
Shared: Horror · Psychological Horror · Indie

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

Dread Flats
Shared: Horror · Supernatural · Psychological Horror