Cool to have a finish product for your Jam ! There's a lot of room for improvement, that's great !
If you want to make it better, here's what you can do : add sound fxs, change the music (4 notes in loop is hard to listen more than 2 minutes), and have some objectives like destroy certain places, certain amount of some type, find hidden objects or something to drive the player :)
Also lock the camera rotation on the vertical axis, it will feel better if the car roll over.
Anyway, good start, keep it up :)