Games like Mall Corp
Games like Mall Corp include Firewatch, What Remains of Edith Finch, Layers of Fear (2016), Scanner Sombre, and Escape the Backrooms. We matched them by the tags players give Mall Corp on Steam (Adventure, Walking Simulator, Exploration, First-Person, and Horror): closest matches first, and among equally close ones the better-known games.

Firewatch
Shared: Adventure · Walking Simulator · First-Person

What Remains of Edith Finch
Shared: Walking Simulator · Adventure · First-Person

Layers of Fear (2016)
Shared: Walking Simulator · Horror · First-Person

Scanner Sombre
Shared: Walking Simulator · Exploration · Adventure

Escape the Backrooms
Shared: Horror · First-Person · Adventure

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

Outlast
Shared: First-Person · Horror · Atmospheric

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

SOMA
Shared: Horror · Exploration · Atmospheric

Lethal Company
Shared: First-Person · Horror · Exploration

The Long Dark
Shared: Exploration · Adventure · First-Person

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

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

Fears to Fathom® - Scratch Creek
Shared: Adventure · Horror · Walking Simulator

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

Among the Sleep - Enhanced Edition
Shared: Adventure · Horror · First-Person

INFRA
Shared: Exploration · Walking Simulator · Adventure

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

Valley
Shared: Adventure · Exploration · First-Person

Slender: The Arrival
Shared: Horror · First-Person · Walking Simulator

Visage
Shared: Horror · First-Person · Adventure

Slime Rancher
Shared: Adventure · Exploration · First-Person

Stray
Shared: Adventure · Exploration · Singleplayer

Outer Wilds
Shared: Exploration · Adventure · Atmospheric