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

Firewatch
Shared: Adventure · Walking Simulator · Atmospheric

What Remains of Edith Finch
Shared: Walking Simulator · Atmospheric · Adventure

Layers of Fear (2016)
Shared: Horror · Walking Simulator · Atmospheric

Amnesia: A Machine For Pigs
Shared: Walking Simulator · Horror · First-Person

SOMA
Shared: Horror · Atmospheric · Psychological Horror

Outer Wilds
Shared: Adventure · Mystery · Atmospheric

Still Wakes the Deep
Shared: Horror · Walking Simulator · First-Person

Outlast
Shared: Horror · First-Person · Atmospheric

Mouthwashing
Shared: Horror · Psychological Horror · Atmospheric

Poppy Playtime
Shared: Horror · First-Person · Singleplayer

The Park®
Shared: Horror · Walking Simulator · First-Person

MiSide
Shared: Horror · Psychological Horror · First-Person

The Vanishing of Ethan Carter
Shared: Walking Simulator · Atmospheric · Mystery

INFRA
Shared: Walking Simulator · Adventure · First-Person

Blair Witch
Shared: Adventure · Horror · First-Person

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

Fears to Fathom - Woodbury Getaway
Shared: Adventure · Horror · First-Person

The Beast Inside
Shared: Adventure · Horror · First-Person

The Beginner's Guide
Shared: Walking Simulator · First-Person · Atmospheric

Little Nightmares
Shared: Adventure · Horror · Atmospheric

Kholat
Shared: Horror · Walking Simulator · Atmospheric

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

Among the Sleep - Enhanced Edition
Shared: Horror · Adventure · Atmospheric

Scanner Sombre
Shared: Walking Simulator · Horror · Adventure