Games like The Gretlow Tapes
Games like The Gretlow Tapes include Mouthwashing, SOMA, What Remains of Edith Finch, Firewatch, and Layers of Fear (2016). We matched them by the tags players give The Gretlow Tapes on Steam (Horror, Psychological Horror, Atmospheric, Realistic, and Supernatural): closest matches first, and among equally close ones the better-known games.

Mouthwashing
Shared: Horror · Psychological Horror · Atmospheric

SOMA
Shared: Horror · Psychological Horror · Atmospheric

What Remains of Edith Finch
Shared: Atmospheric · Story Rich · Walking Simulator

Firewatch
Shared: Atmospheric · Story Rich · Walking Simulator

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

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

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

Phasmophobia
Shared: Horror · Psychological Horror · Supernatural

SILENT HILL 2
Shared: Horror · Psychological Horror · Atmospheric

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

The Painscreek Killings
Shared: Horror · Atmospheric · Story Rich

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

MiSide
Shared: Psychological Horror · Horror · Story Rich

DON'T SCREAM
Shared: Horror · Psychological Horror · Atmospheric

Fears to Fathom - Ironbark Lookout
Shared: Horror · Psychological Horror · Atmospheric

Summer of '58
Shared: Horror · Atmospheric · Psychological Horror

Visage
Shared: Horror · Psychological Horror · Atmospheric

Outlast
Shared: Horror · Atmospheric · Psychological Horror

Hellblade: Senua's Sacrifice
Shared: Atmospheric · Story Rich · Horror

Outer Wilds
Shared: Exploration · Story Rich · Atmospheric

Darkwood
Shared: Horror · Psychological Horror · Atmospheric

Little Nightmares II
Shared: Horror · Atmospheric · Psychological Horror

Little Nightmares
Shared: Horror · Atmospheric · Psychological Horror

Layers of Fear 2 (2019)
Shared: Horror · Psychological Horror · Atmospheric