Games like Idle Hero
Games like Idle Hero include IdleOn - The Incremental MMO, Dragon Cliff, Stoneshard, Cookie Clicker, and Swag and Sorcery. We matched them by the tags players give Idle Hero on Steam (RPG, Idler, Incremental, Tactical RPG, and Roguelike): closest matches first, and among equally close ones the better-known games.

IdleOn - The Incremental MMO
Shared: Idler · Incremental · RPG

Dragon Cliff
Shared: RPG · Idler · Incremental

Stoneshard
Shared: RPG · Roguelike · Survival

Cookie Clicker
Shared: Idler · Incremental · Pixel Graphics

Swag and Sorcery
Shared: RPG · Incremental · Pixel Graphics

Dwarves: Glory, Death and Loot
Shared: RPG · Auto Battler · Roguelike

Firestone – Idle Clicker Online RPG
Shared: Idler · Incremental · RPG

Kenshi
Shared: RPG · Survival · Simulation

Nomad Idle
Shared: Idler · Incremental · Roguelike

Home Behind 2
Shared: RPG · Roguelike · Survival

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

Tower Wizard
Shared: Idler · Incremental · Pixel Graphics

9 Kings
Shared: RPG · Roguelike · Auto Battler

Loot Loop
Shared: Incremental · Idler · Auto Battler

Incremental Epic Hero 2
Shared: Idler · RPG · Auto Battler

Despot's Game: Dystopian Battle Simulator
Shared: Roguelike · RPG · Auto Battler

Graveyard Keeper
Shared: RPG · Pixel Graphics · Simulation

Stardew Valley
Shared: RPG · Pixel Graphics · Simulation

Tap Heroes
Shared: Incremental · Idler · Tactical RPG

Samawa Idle
Shared: Idler · Incremental · RPG

Idle Champions of the Forgotten Realms
Shared: Idler · Incremental · RPG

Maktala: Slime Lootfest
Shared: Incremental · Idler · RPG

Orc Incremental
Shared: Idler · Incremental · RPG

Super Fantasy Kingdom
Shared: RPG · Roguelike · Auto Battler