Games like Backrooms: The Game
Games like Backrooms: The Game include The Forest, Five Nights at Freddy's: Security Breach, Slime Rancher, Resident Evil Requiem, and Garry's Mod. We matched them by the tags players give Backrooms: The Game on Steam (Action, Horror, Singleplayer, First-Person, and Supernatural): closest matches first, and among equally close ones the better-known games.

The Forest
Shared: Horror · Adventure · Action

Five Nights at Freddy's: Security Breach
Shared: Horror · Singleplayer · First-Person

Slime Rancher
Shared: Singleplayer · Adventure · First-Person

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

Garry's Mod
Shared: Sandbox · First-Person · Singleplayer

Thief Simulator
Shared: Singleplayer · Simulation · First-Person

Ready or Not
Shared: Singleplayer · Horror · First-Person

Metro Exodus
Shared: Singleplayer · Action · Horror

Resident Evil Village
Shared: Horror · Action · Singleplayer

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

Ghostwire: Tokyo
Shared: Singleplayer · Horror · First-Person

BONEWORKS
Shared: Action · Singleplayer · Sandbox

Ravenfield
Shared: Singleplayer · Action · First-Person

Bendy and the Dark Revival
Shared: Horror · Singleplayer · Action

Half-Life 2
Shared: Action · Singleplayer · First-Person

Atomic Heart
Shared: Action · Adventure · Singleplayer

Five Nights at Freddy's: Secret of the Mimic
Shared: Horror · First-Person · Action

Fallout 4
Shared: Singleplayer · Adventure · First-Person

Black Mesa
Shared: Action · First-Person · Singleplayer

House Flipper
Shared: Singleplayer · Simulation · Action

鬼谷八荒 Tale of Immortal
Shared: Singleplayer · Simulation · Action

BioShock Infinite
Shared: Action · First-Person · Singleplayer

METRO Last Light Redux
Shared: Action · Horror · Singleplayer

METRO 2033 Redux
Shared: Horror · Action · Singleplayer