Games like Cosmic Fear
Games like Cosmic Fear include SOMA, What Remains of Edith Finch, Firewatch, Still Wakes the Deep, and Outer Wilds. We matched them by the tags players give Cosmic Fear on Steam (Horror, Lovecraftian, Psychological Horror, Atmospheric, and Exploration): closest matches first, and among equally close ones the better-known games.

SOMA
Shared: Horror · Psychological Horror · Atmospheric

What Remains of Edith Finch
Shared: Atmospheric · Story Rich · Exploration

Firewatch
Shared: Atmospheric · Story Rich · Mystery

Still Wakes the Deep
Shared: Horror · Psychological Horror · Lovecraftian

Outer Wilds
Shared: Exploration · Story Rich · Mystery

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

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

DREDGE
Shared: Lovecraftian · Exploration · Atmospheric

Lethal Company
Shared: Horror · Psychological Horror · Exploration

Mouthwashing
Shared: Horror · Psychological Horror · Atmospheric

Dagon: by H. P. Lovecraft
Shared: Horror · Lovecraftian · Atmospheric

Call of Cthulhu®
Shared: Horror · Lovecraftian · Psychological Horror

MiSide
Shared: Psychological Horror · Horror · Story Rich

Sally Face - Episode One
Shared: Psychological Horror · Horror · Story Rich

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

Poppy Playtime
Shared: Horror · Psychological Horror · Mystery

The Painscreek Killings
Shared: Horror · Exploration · Mystery

The Vanishing of Ethan Carter
Shared: Atmospheric · Mystery · Horror

No, I'm not a Human
Shared: Horror · Psychological Horror · Atmospheric

The Room Two
Shared: Horror · Atmospheric · Mystery

SILENT HILL 2
Shared: Horror · Psychological Horror · Atmospheric

ROUTINE
Shared: Psychological Horror · Atmospheric · Horror

Inside the Backrooms
Shared: Horror · Psychological Horror · Exploration

The Room 4: Old Sins
Shared: Lovecraftian · Mystery · Horror