Games like Mizu
Games like Mizu include Just Cause 2, Just Cause™ 3, Grand Theft Auto V Legacy, SPORE™, and Crimson Desert Enhanced. We matched them by the tags players give Mizu on Steam (Action, Skating, Casual, Exploration, and Sandbox): closest matches first, and among equally close ones the better-known games.

Just Cause 2
Shared: Action · Sandbox · Open World

Just Cause™ 3
Shared: Action · Open World · Sandbox

Grand Theft Auto V Legacy
Shared: Action · Open World · Third Person

SPORE™
Shared: Sandbox · Exploration · Open World

Crimson Desert Enhanced
Shared: Action · Exploration · Open World

Marvel’s Spider-Man Remastered
Shared: Action · Open World · Exploration

skate.
Shared: Action · Sports · Sandbox

Steep™
Shared: Action · Sports · Open World

Slime Rancher
Shared: Exploration · Open World · Sandbox

Fallout 4
Shared: Exploration · Open World · Action

Goat Simulator
Shared: Sandbox · Casual · Open World

Goat Simulator 3
Shared: Exploration · Sandbox · Open World

Rise of the Tomb Raider™
Shared: Action · Exploration · Open World

Sonic Frontiers
Shared: Action · Exploration · Open World

Fireworks Mania - An Explosive Simulator
Shared: Sandbox · Exploration · Action

Grand Theft Auto IV: The Complete Edition
Shared: Action · Open World · Sandbox

LEGO® Worlds
Shared: Sandbox · Open World · Exploration

Bully: Scholarship Edition
Shared: Action · Open World · Third Person

Wuthering Waves
Shared: Action · Open World · Exploration

STAR WARS Jedi: Survivor™
Shared: Action · Open World · Exploration

s&box
Shared: Action · Sandbox · Casual

The Infected
Shared: Action · Open World · Exploration

Avorion
Shared: Exploration · Sandbox · Open World

FANTASY LIFE i: The Girl Who Steals Time
Shared: Casual · Action · Exploration