Games like Tiny Hero Idle
Games like Tiny Hero Idle include TBH: Task Bar Hero, Path of Exile, Idle Champions of the Forgotten Realms, Bongo Cat, and IdleOn - The Incremental MMO. We matched them by the tags players give Tiny Hero Idle on Steam (Free to Play, Idler, Incremental, Action RPG, and Hack and Slash): closest matches first, and among equally close ones the better-known games.

TBH: Task Bar Hero
Shared: Idler · Free to Play · Action RPG

Path of Exile
Shared: Free to Play · Action RPG · Hack and Slash

Idle Champions of the Forgotten Realms
Shared: Free to Play · Idler · Incremental

Bongo Cat
Shared: Free to Play · Idler · Incremental

IdleOn - The Incremental MMO
Shared: Free to Play · Idler · Incremental

Wolcen: Lords of Mayhem
Shared: Action RPG · Hack and Slash · Singleplayer

Cell to Singularity - Evolution Never Ends
Shared: Free to Play · Incremental · Idler

Cookie Clicker
Shared: Idler · Incremental · Indie

Warframe
Shared: Free to Play · Action RPG · RPG

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

Torchlight: Infinite
Shared: Free to Play · Hack and Slash · Action RPG

Grim Dawn
Shared: Action RPG · Hack and Slash · Singleplayer

Where Winds Meet
Shared: Free to Play · Action RPG · Singleplayer

Last Epoch
Shared: Action RPG · Hack and Slash · RPG

Melvor Idle
Shared: Idler · Indie · Casual

Diablo® IV
Shared: Action RPG · Hack and Slash · RPG

Deskrawl: Idle ARPG
Shared: Idler · Action RPG · Incremental

Torchlight II
Shared: Action RPG · Hack and Slash · RPG

Hades
Shared: Hack and Slash · Indie · Singleplayer

Keep on Mining!
Shared: Idler · Incremental · Casual

Dragon Cliff
Shared: Idler · Incremental · Casual

GrandChase
Shared: Free to Play · Action RPG · Hack and Slash

BLEACH Brave Souls
Shared: Free to Play · Action RPG · Singleplayer