Games like Incremental Dungeon
Games like Incremental Dungeon include TBH: Task Bar Hero, Idle Champions of the Forgotten Realms, Melvor Idle, Dragon Cliff, and Your Chronicle. We matched them by the tags players give Incremental Dungeon on Steam (Idler, Auto Battler, RPG, Fantasy, and Casual): closest matches first, and among equally close ones the better-known games.

TBH: Task Bar Hero
Shared: Idler · RPG · Pixel Graphics

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

Melvor Idle
Shared: Idler · RPG · Casual

Dragon Cliff
Shared: Idler · RPG · Casual

Your Chronicle
Shared: Idler · RPG · Auto Battler

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

Hero Tale
Shared: Auto Battler · RPG · Idler

Path of Exile
Shared: RPG · Dungeon Crawler · Loot

Firestone – Idle Clicker Online RPG
Shared: Idler · Auto Battler · RPG

Banana
Shared: Idler · Casual · Free to Play

xiuzhen idle
Shared: Idler · RPG · Casual

Trove
Shared: Fantasy · RPG · Pixel Graphics

Legends of Dragaea: Idle Dungeons
Shared: Idler · Auto Battler · RPG

Magic Research 2
Shared: Idler · Auto Battler · RPG

Torchlight II
Shared: RPG · Fantasy · Dungeon Crawler

Cookie Clicker
Shared: Idler · Casual · Pixel Graphics

Grim Dawn
Shared: RPG · Dungeon Crawler · Loot

Loot Loop
Shared: Idler · Casual · Auto Battler

Path of Idle: Old Gods Rising
Shared: Idler · RPG · Casual

Crusaders Quest : Hero Town
Shared: RPG · Idler · Fantasy

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

The Slormancer
Shared: RPG · Dungeon Crawler · Loot

Desktop Raid
Shared: Idler · RPG · Casual

Book of Yog Idle RPG
Shared: Auto Battler · Casual · Loot