Everyone knows that a car can't flight. It doesn't have wings to gather some momentum and fly. Maybe, cars can fly in the future, but that is not possible in this era. Even if, you put some rocket on it, it will be impossible to fly.
However, this game will defy gravity as the cars here do fly. It has a rocket that allows it to fly ofr a short time. The goal here is to get to your destination, but that destination is not accessible if you are not going to use the rocket, hence, this game is called rocket car.