Games like Mushroom Challenge
Games like Mushroom Challenge include Firewatch, [Chillas Art] The Closing Shift, Deliver Us The Moon, Drug Dealer Simulator, and Internet Cafe Simulator 2. We matched them by the tags players give Mushroom Challenge on Steam (Action, Simulation, Immersive Sim, Adventure, and Walking Simulator): closest matches first, and among equally close ones the better-known games.

Firewatch
Shared: Adventure · Walking Simulator · Atmospheric

[Chillas Art] The Closing Shift
Shared: Simulation · Adventure · Action

Deliver Us The Moon
Shared: Action · Adventure · Indie

Drug Dealer Simulator
Shared: Simulation · Action · Indie

Internet Cafe Simulator 2
Shared: Simulation · 3D · Immersive Sim

House Flipper
Shared: Simulation · Singleplayer · Immersive Sim

Thief Simulator 2
Shared: Simulation · Action · Adventure

Tomb Raider Game of the Year
Shared: Action · Adventure · Singleplayer

Rise of the Tomb Raider™
Shared: Action · Adventure · Singleplayer

Feed and Grow: Fish
Shared: Simulation · Action · Adventure

A Plague Tale: Requiem
Shared: Action · Adventure · Atmospheric

Crime Scene Cleaner
Shared: Simulation · Action · Singleplayer

Black Myth: Wukong
Shared: Action · Adventure · Singleplayer

Totally Accurate Battle Simulator
Shared: Simulation · Adventure · Singleplayer

IRON NEST: Heavy Turret Simulator
Shared: Simulation · Action · 3D

The Long Dark
Shared: Atmospheric · Adventure · Simulation

鬼谷八荒 Tale of Immortal
Shared: Simulation · Action · Singleplayer

OUTBRK
Shared: Simulation · Immersive Sim · Adventure

[Chillas Art] The Convenience Store
Shared: Simulation · Adventure · Action

Thief Simulator
Shared: Simulation · Adventure · Action

Slime Rancher
Shared: Adventure · Simulation · Singleplayer

Platform 8
Shared: Simulation · Adventure · Walking Simulator

Prison Escape Simulator: Dig Out
Shared: Simulation · 3D · Action

Ori and the Will of the Wisps
Shared: Action · Adventure · Atmospheric