I played your Trakmania-style game. The concept is a winning one, as the original game already demonstrates. But don't forget the immediacy and rapidity of continuous testing. The tracks are often too long and monotonous. The sound is missing, which is 80% of the perception of a game. The wheels don't slip, but get stuck. The same goes for the bumper, which gets stuck on the steps of the track. These are the main things that made me abandon the game prematurely. They are the things necessary to close the loop and consider it a game and not a development test.