Games like Still Wakes the Deep
Games like Still Wakes the Deep include SOMA, Outlast, Amnesia: The Dark Descent, Mouthwashing, and Outlast 2. We matched them by the tags players give Still Wakes the Deep on Steam (Horror, Psychological Horror, Gore, Lovecraftian, and First-Person): closest matches first, and among equally close ones the better-known games.

SOMA
Shared: Horror · Psychological Horror · Story Rich

Outlast
Shared: Horror · Psychological Horror · First-Person

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

Mouthwashing
Shared: Horror · Psychological Horror · Story Rich

Outlast 2
Shared: Horror · Psychological Horror · Gore

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

What Remains of Edith Finch
Shared: Story Rich · Walking Simulator · First-Person

Scorn
Shared: Horror · Gore · First-Person

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

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

Resident Evil Village
Shared: Horror · First-Person · Gore

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

Firewatch
Shared: Walking Simulator · Story Rich · First-Person

ROUTINE
Shared: Psychological Horror · Horror · Atmospheric

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

MiSide
Shared: Psychological Horror · Horror · Story Rich

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

The Beast Inside
Shared: Horror · First-Person · Psychological Horror

Little Nightmares II
Shared: Horror · Psychological Horror · Adventure

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

Visage
Shared: Horror · Psychological Horror · First-Person

Blair Witch
Shared: Horror · Psychological Horror · First-Person

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

Little Nightmares
Shared: Horror · Atmospheric · Adventure