This is a really great game which I think is pretty enjoyable. I do have my gripes though, and some things that I have to say to improve would be:
-smooth turning to make going round corners more satisfying (Quaternion.Lerp would be good at this)
-more sfx for skidding and driving
-a way to look behind you so you can shoot anyone following you
-a more clear path of your objective. (i know there was that green arrow thing but it was quite inaccurate and it only helped you get to the card. i got stuck in the suburban area for quite a while)
-more variation in the rocks (the rocks in the desert really stuck out for me because they had the exact same size and rotation, a bit of a nitpick but it couldv'e been solved in 5 minutes nonetheless.)
but other than that its very solid and fun to play. I would rate it a 6.5/10.(and a 8/10 if you updated the game with the things i mentioned. Don't take my criticism too personally though as mine is also pretty crap because I ran out of time to polish it.If there's one thing I learned in this gamejam you should ALWAYS leave one day to polish the game, don't just leave it last to the last 30 minutes.