Games like Motherland
Games like Motherland include Firewatch, What Remains of Edith Finch, Layers of Fear (2016), SOMA, and Outlast. We matched them by the tags players give Motherland on Steam (Walking Simulator, Open World, Atmospheric, Realistic, and First-Person): closest matches first, and among equally close ones the better-known games.

Firewatch
Shared: Atmospheric · Walking Simulator · First-Person

What Remains of Edith Finch
Shared: Walking Simulator · Atmospheric · Story Rich

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

SOMA
Shared: Atmospheric · Horror · Psychological Horror

Outlast
Shared: Atmospheric · First-Person · Horror

DEATH STRANDING DIRECTOR'S CUT
Shared: Open World · Walking Simulator · Atmospheric

The Forest
Shared: Open World · Horror · First-Person

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

Metro Exodus
Shared: Open World · Atmospheric · Story Rich

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

Red Dead Redemption 2
Shared: Open World · Story Rich · Realistic

Mouthwashing
Shared: Atmospheric · Horror · Psychological Horror

The Long Dark
Shared: Open World · Atmospheric · First-Person

Fallout 4
Shared: Open World · Atmospheric · First-Person

Visage
Shared: Horror · Psychological Horror · First-Person

We Happy Few
Shared: Open World · First-Person · Adventure

Outer Wilds
Shared: Atmospheric · Open World · Story Rich

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

S.T.A.L.K.E.R. 2: Heart of Chornobyl - Standard Edition
Shared: Open World · Atmospheric · First-Person

POOLS
Shared: Walking Simulator · Atmospheric · Realistic

Little Nightmares
Shared: Atmospheric · Horror · Adventure

Subnautica 2
Shared: Horror · Open World · First-Person

Darkwood
Shared: Horror · Psychological Horror · Atmospheric

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