Games like Liminal Horror
Games like Liminal Horror include Firewatch, What Remains of Edith Finch, Layers of Fear (2016), Mouthwashing, and Sally Face - Episode One. We matched them by the tags players give Liminal Horror on Steam (Horror, Indie, Adventure, Psychological Horror, and Mystery): closest matches first, and among equally close ones the better-known games.

Firewatch
Shared: Adventure · Atmospheric · Mystery

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

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

Mouthwashing
Shared: Horror · Psychological Horror · Indie

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

Amnesia: A Machine For Pigs
Shared: Horror · Walking Simulator · Psychological Horror

POOLS
Shared: Psychological Horror · Walking Simulator · Atmospheric

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

SOMA
Shared: Horror · Psychological Horror · Atmospheric

The Exit 8
Shared: Horror · Walking Simulator · Exploration

Outer Wilds
Shared: Adventure · Mystery · Exploration

Iron Lung
Shared: Horror · Psychological Horror · Indie

Visage
Shared: Horror · Psychological Horror · Adventure

Little Nightmares
Shared: Horror · Adventure · Atmospheric

No one lives under the lighthouse Director's cut
Shared: Horror · Indie · Adventure

Poppy Playtime
Shared: Horror · Psychological Horror · Mystery

[Chillas Art] The Convenience Store
Shared: Horror · Indie · Adventure

Rusty Lake Paradise
Shared: Indie · Adventure · Horror

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

Still Wakes the Deep
Shared: Horror · Psychological Horror · Walking Simulator

Scanner Sombre
Shared: Horror · Adventure · Walking Simulator

Little Nightmares II
Shared: Horror · Adventure · Psychological Horror

Subliminal
Shared: Psychological Horror · Horror · Mystery

Detention
Shared: Horror · Indie · Psychological Horror