Games like Ultra Boat Game!!!
Games like Ultra Boat Game!!! include Slime Rancher, Mon Bazou, Forza Horizon 5, Firewatch, and Journey. We matched them by the tags players give Ultra Boat Game!!! on Steam (Casual, Adventure, Sports, Sandbox, and Racing): closest matches first, and among equally close ones the better-known games.

Slime Rancher
Shared: Adventure · Exploration · Sandbox

Mon Bazou
Shared: Sandbox · Racing · Exploration

Forza Horizon 5
Shared: Racing · Adventure · Driving

Firewatch
Shared: Adventure · Walking Simulator · Exploration

Journey
Shared: Adventure · Exploration · Casual

Jalopy
Shared: Racing · Casual · Exploration

Terraria
Shared: Sandbox · Adventure · Exploration

The Crew Motorfest
Shared: Racing · Sandbox · Sports

JDM: Japanese Drift Master
Shared: Racing · Sports · Exploration

DAVE THE DIVER
Shared: Casual · Adventure · Exploration

Goat Simulator 3
Shared: Sandbox · Exploration · Casual

s&box
Shared: Casual · Sandbox · Adventure

Starbound
Shared: Sandbox · Adventure · Casual

Bus World
Shared: Adventure · Racing · Casual

Forza Horizon 6
Shared: Racing · Sports · Exploration

UNDER the SAND - a road trip simulator
Shared: Casual · Exploration · Racing

RV There Yet?
Shared: Adventure · Exploration · Driving

Baby Steps
Shared: Adventure · Casual · Walking Simulator

Don't Starve
Shared: Adventure · Sandbox · Exploration

Cairn
Shared: Adventure · Exploration · Sports

CarX Street
Shared: Racing · Sandbox · Sports

ABZU
Shared: Adventure · Casual · Exploration

Garfield Kart
Shared: Sports · Racing · Casual

Disney Dreamlight Valley
Shared: Adventure · Casual · Sandbox