Games like Swaddle
Games like Swaddle include No, I'm not a Human, SOMA, Outlast, Mouthwashing, and The Mortuary Assistant. We matched them by the tags players give Swaddle on Steam (Horror, Dark, Atmospheric, Demons, and Simulation): closest matches first, and among equally close ones the better-known games.

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

SOMA
Shared: Horror · Atmospheric · Dark

Outlast
Shared: Horror · Atmospheric · First-Person

Mouthwashing
Shared: Horror · Atmospheric · Psychological Horror

The Mortuary Assistant
Shared: Horror · Demons · Atmospheric

Phasmophobia
Shared: Horror · Psychological Horror · Dark

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

Visage
Shared: Horror · Dark · Psychological Horror

Buckshot Roulette
Shared: Dark · Horror · First-Person

Summer of '58
Shared: Horror · Atmospheric · First-Person

MiSide
Shared: Horror · Psychological Horror · First-Person

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

The Cabin Factory
Shared: Horror · Atmospheric · Psychological Horror

Outlast 2
Shared: Horror · Dark · First-Person

Zoochosis
Shared: Dark · Horror · Atmospheric

Five Nights at Freddy's
Shared: Horror · Dark · Psychological Horror

Poppy Playtime
Shared: Horror · Dark · First-Person

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

Iron Lung
Shared: Horror · Atmospheric · Psychological Horror

Lethal Company
Shared: Horror · First-Person · Atmospheric

Dollmare
Shared: Horror · Simulation · 3D

From The Darkness
Shared: Horror · Dark · Psychological Horror

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

Locked Up
Shared: Horror · Simulation · Atmospheric