Games like Idle Demon Summoner
Games like Idle Demon Summoner include Cookie Clicker, Nodebuster, Tower Wizard, Shelldiver, and Loot Loop. We matched them by the tags players give Idle Demon Summoner on Steam (Casual, Idler, Creature Collector, Auto Battler, and 2D): closest matches first, and among equally close ones the better-known games.

Cookie Clicker
Shared: Idler · Casual · Incremental

Nodebuster
Shared: Casual · Idler · Incremental

Tower Wizard
Shared: Idler · Incremental · 2D

Shelldiver
Shared: Casual · Idler · Incremental

Loot Loop
Shared: Casual · Idler · Incremental

Digseum
Shared: Casual · Idler · Incremental

Dragon Cliff
Shared: Idler · Casual · Pixel Graphics

Cauldron
Shared: Casual · Incremental · Auto Battler

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

Zero Stress King: Idle Defense
Shared: Idler · Casual · Auto Battler

Tiny Pasture
Shared: Idler · Casual · Creature Collector

Click and Conquer
Shared: Casual · Idler · Incremental

Click the Button
Shared: Casual · Idler · Incremental

Touhou Mystia's Izakaya
Shared: Casual · Pixel Graphics · Simulation

Cornerpond
Shared: Idler · Creature Collector · Casual

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

Horripilant
Shared: Idler · Casual · Incremental

Cast n Chill
Shared: Idler · Pixel Graphics · Creature Collector

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

Melvor Idle
Shared: Idler · Casual · 2D

Your Big, Cute Monster Farm
Shared: Casual · Idler · Creature Collector

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

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

Orc Incremental
Shared: Idler · Auto Battler · Incremental