Games like Mushroom Season
Games like Mushroom Season include My Summer Car, BeamNG.drive, Euro Truck Simulator 2, PC Building Simulator, and PowerWash Simulator. We matched them by the tags players give Mushroom Season on Steam (Casual, Simulation, Sandbox, Immersive Sim, and Walking Simulator): closest matches first, and among equally close ones the better-known games.

My Summer Car
Shared: Simulation · Driving · First-Person

BeamNG.drive
Shared: Simulation · Driving · Sandbox

Euro Truck Simulator 2
Shared: Simulation · Driving · Realistic

PC Building Simulator
Shared: Simulation · Immersive Sim · Sandbox

PowerWash Simulator
Shared: Casual · Simulation · Sandbox

American Truck Simulator
Shared: Simulation · Driving · Realistic

The Sims™ 4
Shared: Simulation · Sandbox · Casual

Train Simulator Classic
Shared: Simulation · Casual · Driving

House Flipper
Shared: Simulation · Casual · Sandbox

DrainSim
Shared: Casual · Simulation · Sandbox

Paralives
Shared: Simulation · Sandbox · Casual

theHunter: Call of the Wild™
Shared: Simulation · Relaxing · Sandbox

Car Mechanic Simulator 2021
Shared: Simulation · Sandbox · Realistic

Garry's Mod
Shared: Sandbox · Casual · First-Person

My Winter Car
Shared: Simulation · Driving · First-Person

Car Dealer Simulator
Shared: Simulation · Driving · Immersive Sim

Kenshi
Shared: Sandbox · Immersive Sim · Simulation

SnowRunner
Shared: Simulation · Driving · Sandbox

PowerWash Simulator 2
Shared: Casual · Simulation · Sandbox

Gold Mining Simulator
Shared: Simulation · Sandbox · Realistic

Supermarket Simulator
Shared: Simulation · First-Person · Immersive Sim

Train Sim World® 2020
Shared: Simulation · Casual · Driving

Derail Valley
Shared: Simulation · Realistic · Driving

Streamer Life Simulator 2
Shared: Simulation · Immersive Sim · Casual