Games like Idle Income
Games like Idle Income include Cookie Clicker, Stardew Valley, Digseum, Nodebuster, and WorldBox - God Simulator. We matched them by the tags players give Idle Income on Steam (Simulation, Idler, Indie, Incremental, and Sandbox): closest matches first, and among equally close ones the better-known games.

Cookie Clicker
Shared: Idler · Incremental · Indie

Stardew Valley
Shared: Simulation · Pixel Graphics · Relaxing

Digseum
Shared: Idler · Incremental · Simulation

Nodebuster
Shared: Incremental · Idler · Simulation

WorldBox - God Simulator
Shared: Simulation · Sandbox · Pixel Graphics

Graveyard Keeper
Shared: Simulation · Pixel Graphics · Sandbox

Kenshi
Shared: Sandbox · Simulation · Survival

Scritchy Scratchy
Shared: Idler · Incremental · Simulation

Banished
Shared: Simulation · Indie · Sandbox

Mini Motorways
Shared: Simulation · Management · Indie

Loot Loop
Shared: Simulation · Incremental · Idler

Planet Coaster
Shared: Simulation · Sandbox · Management

Fortune Mill
Shared: Idler · Incremental · Simulation

Foundation
Shared: Simulation · Sandbox · Management

Potion Craft: Alchemist Simulator
Shared: Simulation · Indie · Relaxing

Dragon Cliff
Shared: Idler · Incremental · Simulation

Game Dev Tycoon
Shared: Simulation · Indie · Management

Shelldiver
Shared: Incremental · Idler · Management

Tiny Pasture
Shared: Idler · Incremental · Pixel Graphics

Rusty's Retirement
Shared: Idler · Simulation · Management

Kingdoms and Castles
Shared: Simulation · Management · Sandbox

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

RimWorld
Shared: Sandbox · Simulation · Management

Bills Must Be Paid
Shared: Incremental · Idler · Indie