Games like Mellow's Garden
Games like Mellow's Garden include Stardew Valley, Cities: Skylines, Cities: Skylines II, Farm Together, and Planet Zoo. We matched them by the tags players give Mellow's Garden on Steam (Simulation, Farming Sim, Cozy, Sandbox, and Fishing): closest matches first, and among equally close ones the better-known games.

Stardew Valley
Shared: Farming Sim · Simulation · Sandbox

Cities: Skylines
Shared: Simulation · Building · Sandbox

Cities: Skylines II
Shared: Simulation · Sandbox · Building

Farm Together
Shared: Simulation · Farming Sim · Agriculture

Planet Zoo
Shared: Simulation · Sandbox · Building

Tiny Glade
Shared: Building · Sandbox · Cozy

Planet Coaster
Shared: Simulation · Sandbox · Building

Megaquarium
Shared: Simulation · Sandbox · Building

Farm Manager 2018
Shared: Farming Sim · Casual · Building

Luma Island
Shared: Farming Sim · Cozy · Simulation

My Dream Setup
Shared: Simulation · Building · Sandbox

Farming Simulator 22
Shared: Simulation · Farming Sim · Sandbox

I Am Future: Cozy Apocalypse Survival
Shared: Farming Sim · Simulation · Casual

House Flipper
Shared: Simulation · Building · Sandbox

Supermarket Simulator
Shared: Simulation · Management · Building

Paralives
Shared: Simulation · Building · Sandbox

Garry's Mod
Shared: Sandbox · Building · Simulation

Jurassic World Evolution
Shared: Simulation · Building · Sandbox

Startup Company
Shared: Simulation · Sandbox · Casual

Two Point Museum
Shared: Simulation · Building · Casual

My Time at Portia
Shared: Farming Sim · Simulation · Casual

Prison Architect
Shared: Simulation · Sandbox · Building

Coral Island
Shared: Farming Sim · Simulation · Agriculture

Farm Together 2
Shared: Farming Sim · Sandbox · Agriculture