Great game! It really reminds me of Road Rash on the Sega Genesis.
One thing I noticed is that the enemy collision boxes felt a bit too large. A few times I was sure I had passed safely, but the game still counted it as a bump.
I also found the game a bit easy. Once I reached first place, I could mostly just hold the forward button and keep the lead without much trouble.
Overall, I had fun playing it. Nice job! :)