Before the evaluation, let me greet you by the title, my life as Guitar Hero fan supports this reference!
The music is well placed, a mix of rough and joyful; I liked it. The concept reminds me some NES games, like Konami's Antarctic Adventure, but it's pretty original the way you can force the others to gain speed as you throw them into the stuff on the field. In the same way, the other cars can do the same with you and this can be a little frustrating, once some things on the field seems to teleport you to other position away and you end up losing control of the situation. But it's really fun to play, I started it again a couple of times till get the last position, and I hope you go on with the project!
I see you've got good abilities on Godot and that makes me confident the engine is getting the due attention and will gain the support it deserves. Thanks for it and good luck!