Games like Aquarium Designer
Games like Aquarium Designer include Planet Coaster, Potion Craft: Alchemist Simulator, The Sims™ 4, Shelldiver, and PC Building Simulator. We matched them by the tags players give Aquarium Designer on Steam (Underwater, Relaxing, Family Friendly, Submarine, and Resource Management): closest matches first, and among equally close ones the better-known games.

Planet Coaster
Shared: Family Friendly · Relaxing · Management

Potion Craft: Alchemist Simulator
Shared: Relaxing · Singleplayer · Resource Management

The Sims™ 4
Shared: Life Sim · Relaxing · Singleplayer

Shelldiver
Shared: Resource Management · Relaxing · Management

PC Building Simulator
Shared: Management · Realistic · Relaxing

DAVE THE DIVER
Shared: Relaxing · Underwater · Management

inZOI
Shared: Life Sim · Realistic · Family Friendly

Cooking Simulator
Shared: Realistic · Family Friendly · Singleplayer

Cities: Skylines II
Shared: Management · Realistic · Relaxing

Cities: Skylines
Shared: Management · Resource Management · Singleplayer

ABZU
Shared: Relaxing · Underwater · Family Friendly

Planet Zoo
Shared: Management · Realistic · Family Friendly

Megaquarium
Shared: Underwater · Relaxing · Management

Youtubers Life
Shared: Life Sim · Management · Singleplayer

Cookie Clicker
Shared: Idler · Incremental · Management

Stardew Valley
Shared: Relaxing · Life Sim · Simulation

Supermarket Simulator
Shared: Management · Life Sim · Singleplayer

Scritchy Scratchy
Shared: Resource Management · Relaxing · Idler

Disney Dreamlight Valley
Shared: Relaxing · Life Sim · Family Friendly

Keep on Mining!
Shared: Relaxing · Idler · Incremental

Digseum
Shared: Relaxing · Idler · Management

House Flipper
Shared: Relaxing · Singleplayer · Simulation

Retro Rewind - Video Store Simulator
Shared: Relaxing · Resource Management · Management

Minami Lane
Shared: Relaxing · Life Sim · Management