Games like Omniquarium
Games like Omniquarium include DAVE THE DIVER, Cast n Chill, Shelldiver, Unpacking, and Stardew Valley. We matched them by the tags players give Omniquarium on Steam (Casual, Simulation, Singleplayer, Idler, and 2D): closest matches first, and among equally close ones the better-known games.

DAVE THE DIVER
Shared: Casual · Pixel Graphics · Singleplayer

Cast n Chill
Shared: Pixel Graphics · Idler · Casual

Shelldiver
Shared: Casual · Idler · Simulation

Unpacking
Shared: Casual · Relaxing · Pixel Graphics

Stardew Valley
Shared: Pixel Graphics · Simulation · Relaxing

Digseum
Shared: Casual · Idler · Simulation

Nodebuster
Shared: Casual · Simulation · Idler

Click and Conquer
Shared: Casual · Simulation · Idler

Click the Button
Shared: Casual · Simulation · Idler

Cookie Clicker
Shared: Casual · Idler · Pixel Graphics

Mountain
Shared: Simulation · Casual · Singleplayer

Papers, Please
Shared: Simulation · Singleplayer · Pixel Graphics

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

Potion Craft: Alchemist Simulator
Shared: Singleplayer · Simulation · Relaxing

Cornerpond
Shared: Simulation · Idler · Casual

Maltese's Fluffy Onsen
Shared: Simulation · Casual · Pixel Graphics

Sticky Business
Shared: Casual · Simulation · Relaxing

Slime Rancher 2
Shared: Singleplayer · Relaxing · Simulation

Ballads of Hongye: REBORN
Shared: Casual · Simulation · Relaxing

Tiny Pasture
Shared: Idler · Casual · Pixel Graphics

Cat Goes Fishing
Shared: 2D · Casual · Fishing

Screen Cat
Shared: Casual · Idler · Simulation

Loot Loop
Shared: Casual · Simulation · Idler

Fortune Mill
Shared: Idler · Simulation · Casual