Games like The Quiet Flat
Games like The Quiet Flat include Firewatch, What Remains of Edith Finch, SOMA, Layers of Fear (2016), and Fears to Fathom - Ironbark Lookout. We matched them by the tags players give The Quiet Flat on Steam (Psychological Horror, Horror, Atmospheric, First-Person, and Thriller): closest matches first, and among equally close ones the better-known games.

Firewatch
Shared: Atmospheric · First-Person · Walking Simulator

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

SOMA
Shared: Psychological Horror · Horror · Atmospheric

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

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

Mouthwashing
Shared: Psychological Horror · Horror · Atmospheric

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

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

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

Outlast
Shared: Horror · First-Person · Psychological Horror

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

MiSide
Shared: Psychological Horror · Horror · First-Person

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

Visage
Shared: Psychological Horror · Horror · First-Person

The Park®
Shared: Psychological Horror · Horror · First-Person

Subliminal
Shared: Psychological Horror · Atmospheric · Horror

Psalm 5:9-13
Shared: Psychological Horror · Horror · Exploration

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

ROUTINE
Shared: Psychological Horror · Atmospheric · Horror

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

Outer Wilds
Shared: Exploration · Atmospheric · Mystery

Welcome to Kowloon
Shared: Horror · Psychological Horror · Atmospheric

Sally Face - Episode One
Shared: Psychological Horror · Horror · Atmospheric

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