Games like Don't breathe in!
Games like Don't breathe in! include Poppy Playtime, Inside the Backrooms, SOMA, Lethal Company, and Outlast. We matched them by the tags players give Don't breathe in! on Steam (Horror, Atmospheric, Psychological Horror, Survival Horror, and First-Person): closest matches first, and among equally close ones the better-known games.

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

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

SOMA
Shared: Horror · Atmospheric · Psychological Horror

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

Outlast
Shared: Horror · Atmospheric · Survival Horror

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

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

Escape the Backrooms
Shared: Horror · Psychological Horror · Survival Horror

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

Outlast 2
Shared: Horror · Psychological Horror · Survival Horror

Garten of Banban
Shared: Horror · Psychological Horror · First-Person

Little Nightmares II
Shared: Horror · Atmospheric · Adventure

MiSide
Shared: Psychological Horror · Horror · First-Person

Amnesia: Rebirth
Shared: First-Person · Horror · Puzzle

Little Nightmares
Shared: Horror · Atmospheric · Adventure

ROUTINE
Shared: Psychological Horror · Atmospheric · Horror

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

Choo-Choo Charles
Shared: Horror · Survival Horror · First-Person

The Room Two
Shared: Atmospheric · Horror · Puzzle

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

Alien: Isolation
Shared: Horror · Survival Horror · Atmospheric

Bendy and the Ink Machine
Shared: Horror · First-Person · Puzzle

Five Nights at Freddy's: Secret of the Mimic
Shared: Horror · First-Person · Adventure

Resident Evil Requiem
Shared: Horror · Survival Horror · First-Person