Games like The Backrooms: Descent
Games like The Backrooms: Descent include Escape the Backrooms, Lethal Company, Phasmophobia, Backrooms: Escape Together, and Zort. We matched them by the tags players give The Backrooms: Descent on Steam (Horror, Adventure, First-Person, Action, and Psychological Horror): closest matches first, and among equally close ones the better-known games.

Escape the Backrooms
Shared: Horror · Co-op · Psychological Horror

Lethal Company
Shared: Horror · Co-op · First-Person

Phasmophobia
Shared: Horror · Co-op · Psychological Horror

Backrooms: Escape Together
Shared: Horror · Co-op · Psychological Horror

Zort
Shared: Horror · Co-op · First-Person

Outlast
Shared: Horror · First-Person · Psychological Horror

Ready or Not
Shared: Horror · Co-op · First-Person

Pacify
Shared: Horror · Co-op · Psychological Horror

Fears to Fathom® - Scratch Creek
Shared: Horror · Co-op · Adventure

Left 4 Dead 2
Shared: Co-op · Horror · Action

PEAK
Shared: Co-op · Adventure · First-Person

The Forest
Shared: Horror · Adventure · First-Person

How to Fish
Shared: Co-op · First-Person · Adventure

The Outlast Trials
Shared: Horror · Co-op · First-Person

Poppy Playtime
Shared: Horror · First-Person · Singleplayer

Inside the Backrooms
Shared: Horror · Co-op · Adventure

Dead by Daylight
Shared: Horror · Co-op · Online Co-Op

The Beast Inside
Shared: Horror · Adventure · First-Person

Demonologist
Shared: Horror · Co-op · First-Person

RV There Yet?
Shared: Co-op · Adventure · First-Person

Nuclear Nightmare
Shared: Horror · Co-op · First-Person

Blood and Bacon
Shared: Horror · Action · Co-op

Content Warning
Shared: Horror · Online Co-Op · Co-op

R.E.P.O.
Shared: Horror · Co-op · First-Person