Games like Gnomophobia
Games like Gnomophobia include Subnautica 2, Lethal Company, Outlast, SOMA, and Darkwood. We matched them by the tags players give Gnomophobia on Steam (Psychological Horror, Survival Horror, Walking Simulator, Atmospheric, and Hidden Object): closest matches first, and among equally close ones the better-known games.

Subnautica 2
Shared: Survival Horror · Exploration · Survival

Lethal Company
Shared: Survival Horror · Psychological Horror · Exploration

Outlast
Shared: Survival Horror · Psychological Horror · Atmospheric

SOMA
Shared: Psychological Horror · Atmospheric · Survival Horror

Darkwood
Shared: Survival Horror · Psychological Horror · Atmospheric

The Forest
Shared: Survival Horror · Open World · Survival

SILENT HILL 2
Shared: Psychological Horror · Survival Horror · Atmospheric

The Long Dark
Shared: Atmospheric · Exploration · Open World

Firewatch
Shared: Atmospheric · Walking Simulator · Adventure

Sons Of The Forest
Shared: Survival Horror · Open World · Survival

Kholat
Shared: Psychological Horror · Walking Simulator · Atmospheric

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

Nuclear Nightmare
Shared: Survival Horror · Psychological Horror · Atmospheric

DREDGE
Shared: Exploration · Psychological Horror · Atmospheric

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

SILENT HILL f
Shared: Psychological Horror · Survival Horror · Atmospheric

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

Visage
Shared: Psychological Horror · Survival Horror · Atmospheric

Outlast 2
Shared: Psychological Horror · Survival Horror · Atmospheric

Mouthwashing
Shared: Psychological Horror · Atmospheric · Walking Simulator

Backrooms: Escape Together
Shared: Psychological Horror · Survival Horror · Atmospheric

Slender: The Arrival
Shared: Survival Horror · Psychological Horror · Atmospheric

Resident Evil 7 Biohazard
Shared: Survival Horror · Psychological Horror · Atmospheric

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