Games like Mutualist
Games like Mutualist include Cookie Clicker, Nodebuster, Shelldiver, Game Dev Tycoon, and (the) Gnorp Apologue. We matched them by the tags players give Mutualist on Steam (Simulation, Strategy, Idler, Incremental, and 2D): closest matches first, and among equally close ones the better-known games.

Cookie Clicker
Shared: Idler · Incremental · Economy

Nodebuster
Shared: Strategy · Incremental · Simulation

Shelldiver
Shared: Incremental · Idler · Simulation

Game Dev Tycoon
Shared: Simulation · Strategy · Management

(the) Gnorp Apologue
Shared: Strategy · Idler · Incremental

Rusty's Retirement
Shared: Idler · Simulation · Management

A Game About Feeding A Black Hole
Shared: Incremental · Strategy · Idler

Chef Knight
Shared: Strategy · Simulation · Incremental

Tower Wizard
Shared: Idler · Incremental · Strategy

Sixty Four
Shared: Strategy · Simulation · Incremental

Fortune Mill
Shared: Idler · Incremental · Simulation

Planet Coaster
Shared: Simulation · Strategy · Management

Foundation
Shared: Simulation · Strategy · Management

Russian Life Simulator
Shared: Simulation · Incremental · 2D

Bills Must Be Paid
Shared: Incremental · Strategy · Idler

Digseum
Shared: Incremental · Idler · Simulation

Cities: Skylines II
Shared: Simulation · Strategy · Management

Mini Motorways
Shared: Simulation · Strategy · Management

Incredicer
Shared: Idler · Incremental · Strategy

Scritchy Scratchy
Shared: Incremental · Idler · Simulation

Loot Loop
Shared: Simulation · Incremental · Idler

Cities: Skylines
Shared: Simulation · Strategy · Management

911 Operator
Shared: Simulation · Strategy · Management

Lyca
Shared: Incremental · Idler · Simulation