Very nice game.
Lowpoly visuals and maps are cool (albeit the bridge parts are tough). The car handling and engine sounds are also on point.
The theme is barely fitting and the background texture doesn't fit the overall artstyle, but it's still a nice game (I would love to create similar 3D game, especially with my own models. Did you use VehicleBody3D for this?)
The onomatopoeia sound effects are also funny XD