Games like The Backrooms Project
Games like The Backrooms Project include Outlast, SOMA, Outlast 2, Darkwood, and Amnesia: The Dark Descent. We matched them by the tags players give The Backrooms Project on Steam (Horror, Psychological Horror, Survival Horror, Gore, and Realistic): closest matches first, and among equally close ones the better-known games.

Outlast
Shared: Horror · Survival Horror · Psychological Horror

SOMA
Shared: Horror · Psychological Horror · Atmospheric

Outlast 2
Shared: Horror · Psychological Horror · Survival Horror

Darkwood
Shared: Horror · Survival Horror · Psychological Horror

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

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

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

Lethal Company
Shared: Horror · Survival Horror · Psychological Horror

Visage
Shared: Horror · Psychological Horror · Survival Horror

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

Dead by Daylight
Shared: Horror · Survival Horror · Gore

Resident Evil Village
Shared: Horror · Survival Horror · Gore

Pacify
Shared: Horror · Psychological Horror · Survival Horror

Still Wakes the Deep
Shared: Horror · Psychological Horror · Gore

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

The Forest
Shared: Horror · Survival Horror · Action

Poppy Playtime
Shared: Horror · Survival Horror · Psychological Horror

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

Dead Space
Shared: Horror · Survival Horror · Psychological Horror

The Beast Inside
Shared: Horror · Survival Horror · Psychological Horror

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

Mouthwashing
Shared: Horror · Psychological Horror · Atmospheric

SILENT HILL f
Shared: Horror · Psychological Horror · Survival Horror

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