Didn't submit my own game on time, so unfortunately I wasn't able to rate this. But I'll give you my thoughts. And actually finishing and submitting a game is a feat in and of itself, so good job there!
Pros: The physics system was a ton of fun to play around with; I honestly kinda left off trying to follow the road, and just jumped from road to road and even on other areas of the map. When I played it this way, it took just the right amount of time to finish the game (I think 6 mins was my time). And I never got stuck! I know physics can be a pain to work with at times, so this is really an accomplishment. The car was fun to control.
Cons: The camera was locked to the rear of the car, which meant jumping, spinning and turning was INCREDIBLY dizzying. The map had a lot of twists and turns, and the car moved pretty fast, which meant in order to drive on the road, you needed to stop all forward movement and inch around turns. Most of the map is like this, so the fun part (going fast and doing physics things) isn't a big part of the game if you stick to the road. And maybe that's not the intention? The theme of the jam is "Exploration" after all, so maybe you're supposed to just cruise around the way I did, I honestly don't know.
Great work here! Keep it up and keep coding.