Games like Backswamps
Games like Backswamps include What Remains of Edith Finch, Firewatch, SOMA, Amnesia: A Machine For Pigs, and Layers of Fear (2016). We matched them by the tags players give Backswamps on Steam (Psychological Horror, Atmospheric, Horror, Exploration, and Mystery): closest matches first, and among equally close ones the better-known games.

What Remains of Edith Finch
Shared: Atmospheric · Mystery · Exploration

Firewatch
Shared: Atmospheric · Adventure · Mystery

SOMA
Shared: Psychological Horror · Horror · Atmospheric

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

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

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

Mouthwashing
Shared: Psychological Horror · Horror · Atmospheric

Outlast
Shared: Horror · Atmospheric · Psychological Horror

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

Outer Wilds
Shared: Exploration · Mystery · Atmospheric

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

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

The Park®
Shared: Psychological Horror · Horror · Atmospheric

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

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

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

Phasmophobia
Shared: Horror · Psychological Horror · First-Person

INFRA
Shared: Atmospheric · Exploration · First-Person

Darkwood
Shared: Horror · Psychological Horror · Atmospheric

Inside the Backrooms
Shared: Horror · Psychological Horror · Exploration

[Chillas Art] The Convenience Store
Shared: Psychological Horror · Horror · Atmospheric

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

The Exit 8
Shared: Exploration · Horror · Psychological Horror

Visage
Shared: Psychological Horror · Horror · Atmospheric