Games like Island Idle RPG
Games like Island Idle RPG include Cookie Clicker, Dragon Cliff, Shelldiver, Kingdoms and Castles, and Hearth and Hamlet. We matched them by the tags players give Island Idle RPG on Steam (Casual, Indie, Idler, Incremental, and Simulation): closest matches first, and among equally close ones the better-known games.

Cookie Clicker
Shared: Idler · Casual · Incremental

Dragon Cliff
Shared: Idler · Casual · Incremental

Shelldiver
Shared: Casual · Incremental · Idler

Kingdoms and Castles
Shared: Simulation · Resource Management · Colony Sim

Hearth and Hamlet
Shared: Casual · Incremental · Idler

Stardew Valley
Shared: Simulation · Farming Sim · RPG

Oxygen Not Included
Shared: Base Building · Colony Sim · Resource Management

Nodebuster
Shared: Casual · Incremental · Idler

Incredicer
Shared: Casual · Idler · Incremental

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

Click the Button
Shared: Casual · Indie · Idler

Keep on Mining!
Shared: Casual · Idler · Incremental

Banished
Shared: Indie · Simulation · Colony Sim

Bills Must Be Paid
Shared: Incremental · Idler · Indie

Fortune Mill
Shared: Idler · Incremental · Casual

Autonauts
Shared: Indie · Casual · Simulation

IDLE BOSS RUSH
Shared: Idler · Incremental · Casual

Prison Architect
Shared: Simulation · Base Building · Colony Sim

Mini Motorways
Shared: Casual · Simulation · Indie

Manor Lords
Shared: Simulation · Base Building · City Builder

Dwarf Fortress
Shared: Simulation · Base Building · Colony Sim

Rusty's Retirement
Shared: Idler · Simulation · Farming Sim

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

Captain of Industry
Shared: Simulation · Base Building · Resource Management