Games like Chillquarium
Games like Chillquarium include Cookie Clicker, Tiny Aquarium: Social Fishkeeping, Cornerpond, Keep on Mining!, and Cast n Chill. We matched them by the tags players give Chillquarium on Steam (Collectathon, Creature Collector, Idler, Incremental, and Capitalism): closest matches first, and among equally close ones the better-known games.

Cookie Clicker
Shared: Idler · Incremental · Collectathon

Tiny Aquarium: Social Fishkeeping
Shared: Collectathon · Creature Collector · Idler

Cornerpond
Shared: Idler · Incremental · Creature Collector

Keep on Mining!
Shared: Idler · Incremental · Capitalism

Cast n Chill
Shared: Idler · Creature Collector · Fishing

Bugtopia
Shared: Collectathon · Idler · Creature Collector

Tiny Pasture
Shared: Idler · Incremental · Creature Collector

Joyquarium
Shared: Creature Collector · Idler · Fishing

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

Croakoloco
Shared: Creature Collector · Idler · Incremental

Digseum
Shared: Incremental · Idler · Casual

Keep on Mining! - Worlds
Shared: Incremental · Idler · Collectathon

Shelldiver
Shared: Incremental · Idler · Casual

Click the Button
Shared: Idler · Incremental · Collectathon

Scritchy Scratchy
Shared: Incremental · Idler · Capitalism

Banana
Shared: Incremental · Idler · 2D

Egg Surprise
Shared: Creature Collector · Incremental · Idler

Budgie's Bug Shop
Shared: Idler · Incremental · Economy

Chonkers
Shared: Creature Collector · Idler · Collectathon

WEBFISHING
Shared: Fishing · Creature Collector · Collectathon

Fishing Inc
Shared: Incremental · Fishing · Idler

Little Aviary
Shared: Creature Collector · Idler · Collectathon

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

Plantera
Shared: Collectathon · Idler · Incremental