Games like /deploy.self
Games like /deploy.self include Lethal Company, Outer Wilds, SOMA, Escape the Backrooms, and MiSide. We matched them by the tags players give /deploy.self on Steam (Horror, Psychological Horror, Space, Adventure, and First-Person): closest matches first, and among equally close ones the better-known games.

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

Outer Wilds
Shared: Space · Adventure · Exploration

SOMA
Shared: Horror · Psychological Horror · Sci-fi

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

MiSide
Shared: Psychological Horror · Horror · First-Person

Outlast
Shared: Horror · Psychological Horror · First-Person

ROUTINE
Shared: Psychological Horror · Sci-fi · Horror

Prey
Shared: Space · Horror · Sci-fi

Alien: Isolation
Shared: Horror · Sci-fi · Space

Mouthwashing
Shared: Horror · Psychological Horror · Retro

No Man's Sky
Shared: Space · Sci-fi · Exploration

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

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

Inside the Backrooms
Shared: Horror · Psychological Horror · Adventure

Subnautica 2
Shared: Horror · Exploration · First-Person

Layers of Fear (2016)
Shared: Horror · Psychological Horror · First-Person

MOLE
Shared: Horror · Psychological Horror · Adventure

Dead Space
Shared: Horror · Space · Psychological Horror

Iron Lung
Shared: Horror · Psychological Horror · Atmospheric

Moons of Madness
Shared: Horror · Adventure · Space

Observation
Shared: Space · Adventure · Horror

Still Wakes the Deep
Shared: Horror · Psychological Horror · First-Person

Starfield
Shared: Space · Sci-fi · First-Person

No, I'm not a Human
Shared: Horror · Psychological Horror · First-Person