Games like Spirit Gems
Games like Spirit Gems include Cookie Clicker, Dragon Cliff, Chillquarium, Nodebuster, and (the) Gnorp Apologue. We matched them by the tags players give Spirit Gems on Steam (Idler, Incremental, Creature Collector, RPG, and Strategy): closest matches first, and among equally close ones the better-known games.

Cookie Clicker
Shared: Idler · Incremental · Casual

Dragon Cliff
Shared: Idler · RPG · Incremental

Chillquarium
Shared: Idler · Creature Collector · Incremental

Nodebuster
Shared: Incremental · Idler · Strategy

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

Shelldiver
Shared: Incremental · Idler · Casual

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

Kiwi Clicker - Juiced Up
Shared: Incremental · Idler · Casual

Plantera
Shared: Idler · Incremental · Collectathon

Tower Wizard
Shared: Idler · Incremental · Strategy

Incredicer
Shared: Idler · Incremental · Strategy

Digseum
Shared: Incremental · Idler · Casual

Tiny Pasture
Shared: Idler · Incremental · Creature Collector

Keep on Mining!
Shared: Idler · Incremental · Casual

Fortune Mill
Shared: Idler · Incremental · Automation

Loot Loop
Shared: Incremental · Idler · Casual

Fish to Dish: Idle Sushi
Shared: Idler · Creature Collector · Incremental

xiuzhen idle
Shared: Idler · RPG · Incremental

Cornerpond
Shared: Idler · Incremental · Creature Collector

Chef Knight
Shared: Incremental · Strategy · Idler

Touhou Mystia's Izakaya
Shared: RPG · Casual · Simulation

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

Bugtopia
Shared: Idler · Incremental · Creature Collector

Game Dev Tycoon
Shared: Strategy · Simulation · Casual