Very eleborated game! It played it on my Android. There the control with the virtual joystick felt a bit better than on the keyboard at the html5 versions. Still needs a bit of exercise to get into it. I think optically it could be still improved. The cars are sort of cute but somehow don't really look cool (Sorry for the critics, I am myself a very bad grafic designer). The ai controlled cars could be a bit more different in their skills. The checkpoints were a bit irritating to me. I understand that they are necessary to check if the player drove the circuit correctly but either make the completely invisble or show clearly their hitbox.
But all in all a solid game! Congratulations!