Games like Creative Aquarium
Games like Creative Aquarium include Draw & Guess, MECCHA CHAMELEON, Cookie Clicker, Among Us, and Hidden Folks. We matched them by the tags players give Creative Aquarium on Steam (Casual, Idler, Hand-drawn, Artificial Intelligence, and 2D): closest matches first, and among equally close ones the better-known games.

Draw & Guess
Shared: Casual · Multiplayer · Party Game

MECCHA CHAMELEON
Shared: Casual · Multiplayer · Hand-drawn

Cookie Clicker
Shared: Idler · Casual · Indie

Among Us
Shared: Multiplayer · 2D · Party Game

Hidden Folks
Shared: Casual · Hand-drawn · Indie

Keep on Mining!
Shared: Idler · Casual · Relaxing

Melvor Idle
Shared: Idler · Casual · 2D

Nodebuster
Shared: Casual · Idler · 2D

Stardew Valley
Shared: Multiplayer · Relaxing · Casual

BidKing
Shared: Casual · Artificial Intelligence · Massively Multiplayer

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

Passpartout: The Starving Artist
Shared: Casual · Hand-drawn · Indie

Timber Rush
Shared: Casual · Idler · Relaxing

ShellShock Live
Shared: Multiplayer · 2D · Casual

Town of Salem
Shared: Multiplayer · Casual · Indie

Shelldiver
Shared: Casual · Idler · 2D

Zup! S
Shared: Casual · 2D · Indie

Fischer's Fishing Journey
Shared: Idler · Casual · 2D

Timberman
Shared: Casual · Multiplayer · 2D

Party Animals
Shared: Casual · Multiplayer · Party Game

Potion Craft: Alchemist Simulator
Shared: Relaxing · 2D · Casual

WEBFISHING
Shared: Casual · Multiplayer · Indie

Click the Button
Shared: Casual · Idler · Indie

Gang Beasts
Shared: Multiplayer · Casual · Party Game