Games like Aquamariner
Games like Aquamariner include WEBFISHING, Slime Rancher 2, Goat Simulator, Slime Rancher, and Townscaper. We matched them by the tags players give Aquamariner on Steam (Fishing, Casual, Creature Collector, Open World, and Singleplayer): closest matches first, and among equally close ones the better-known games.

WEBFISHING
Shared: Fishing · Casual · Creature Collector

Slime Rancher 2
Shared: Open World · Singleplayer · Creature Collector

Goat Simulator
Shared: Open World · Simulation · Casual

Slime Rancher
Shared: Open World · Singleplayer · Casual

Townscaper
Shared: Casual · Sandbox · Singleplayer

Mini Motorways
Shared: Casual · Simulation · Indie

Paralives
Shared: Open World · Simulation · Indie

The Scroll of Taiwu : Beyond The Dome
Shared: Open World · Sandbox · Singleplayer

House Flipper
Shared: Singleplayer · Simulation · Casual

Stardew Valley
Shared: Simulation · Sandbox · Indie

SpaceEngine
Shared: Casual · Open World · Sandbox

PowerWash Simulator
Shared: Casual · Simulation · Sandbox

My Time at Portia
Shared: Open World · Casual · Singleplayer

Cat Goes Fishing
Shared: Fishing · Casual · Indie

DAVE THE DIVER
Shared: Casual · Fishing · Singleplayer

SUMMERHOUSE
Shared: Casual · Singleplayer · Sandbox

Palworld
Shared: Open World · Creature Collector · Indie

DREDGE
Shared: Fishing · Open World · Singleplayer

Fishing Planet
Shared: Fishing · Simulation · Open World

Train Simulator Classic
Shared: Singleplayer · Casual · Simulation

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

Garry's Mod
Shared: Casual · Sandbox · Singleplayer

Ultimate Fishing Simulator
Shared: Fishing · Simulation · Casual

Totally Accurate Battle Simulator
Shared: Simulation · Sandbox · Singleplayer