Games like Planet Scanner
Games like Planet Scanner include Lethal Company, SOMA, Mouthwashing, Dagon: by H. P. Lovecraft, and Alien: Isolation. We matched them by the tags players give Planet Scanner on Steam (Horror, Simulation, Lovecraftian, Space Sim, and Capitalism): closest matches first, and among equally close ones the better-known games.

Lethal Company
Shared: Horror · First-Person · Procedural Generation

SOMA
Shared: Horror · Atmospheric · Lovecraftian

Mouthwashing
Shared: Horror · Retro · Atmospheric

Dagon: by H. P. Lovecraft
Shared: Horror · Lovecraftian · First-Person

Alien: Isolation
Shared: Horror · Aliens · First-Person

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

MOLE
Shared: Horror · Simulation · Retro

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

MiSide
Shared: Horror · First-Person · Psychological Horror

Prey
Shared: Horror · First-Person · Atmospheric

Outlast
Shared: Horror · First-Person · Atmospheric

A Game About Digging A Hole
Shared: Horror · Simulation · Procedural Generation

Amnesia: The Dark Descent
Shared: Horror · Lovecraftian · First-Person

Backrooms: Escape Together
Shared: Horror · First-Person · Atmospheric

Lost in Vivo
Shared: Horror · Lovecraftian · Atmospheric

Lobotomy Corporation | Monster Management Simulation
Shared: Simulation · Horror · Lovecraftian

Supermarket Simulator
Shared: Simulation · First-Person · Capitalism

Shift At Midnight
Shared: Horror · Simulation · Retro

No one lives under the lighthouse Director's cut
Shared: Horror · Lovecraftian · Retro

[Chillas Art] The Convenience Store
Shared: Horror · Simulation · Atmospheric

Five Nights at Freddy's
Shared: Horror · First-Person · Simulation

Iron Lung
Shared: Horror · Atmospheric · Simulation

Content Warning
Shared: Horror · Procedural Generation · First-Person

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