Thank you for your feedbacks ! Yes you are right, there was supposed to be tricks to do in the air with characters inside the car but I couldn't get it in time, the whole boost /air time mecanics took me too long (especially the Popup/scoring things going to the boost bar)
I hope the version we are going to make next will please you :D It will have new art, gamepad support, and maybe 2 players coop.