Games like Soviet Backrooms
Games like Soviet Backrooms include Outlast, SOMA, Poppy Playtime, Lethal Company, and Amnesia: A Machine For Pigs. We matched them by the tags players give Soviet Backrooms on Steam (Psychological Horror, Horror, Walking Simulator, Atmospheric, and Exploration): closest matches first, and among equally close ones the better-known games.

Outlast
Shared: Horror · Psychological Horror · Atmospheric

SOMA
Shared: Psychological Horror · Horror · Atmospheric

Poppy Playtime
Shared: Horror · Psychological Horror · First-Person

Lethal Company
Shared: Horror · First-Person · Psychological Horror

Amnesia: A Machine For Pigs
Shared: Horror · Walking Simulator · Psychological Horror

Firewatch
Shared: Atmospheric · Walking Simulator · Adventure

What Remains of Edith Finch
Shared: Walking Simulator · Atmospheric · Exploration

Layers of Fear (2016)
Shared: Psychological Horror · Horror · Walking Simulator

Mouthwashing
Shared: Psychological Horror · Horror · Atmospheric

Visage
Shared: Psychological Horror · Horror · Survival Horror

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

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

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

Darkwood
Shared: Horror · Psychological Horror · Survival Horror

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

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

Resident Evil 7 Biohazard
Shared: Horror · First-Person · Survival Horror

Pacify
Shared: Horror · Psychological Horror · Exploration

Still Wakes the Deep
Shared: Psychological Horror · Horror · Walking Simulator

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

Summer of '58
Shared: Horror · Psychological Horror · Atmospheric

Phasmophobia
Shared: Horror · Psychological Horror · First-Person

The Park®
Shared: Psychological Horror · Horror · Walking Simulator

Fears to Fathom - Ironbark Lookout
Shared: Psychological Horror · Horror · Atmospheric