This game is funny and cool:

~1 You can jump somewhere and spin in the air about 10 times, and then you land.

~2 Trees don't have collisions (unless only fir trees or oaks do).

~3 On some sections of the road, the road ahead isn't visible, but if you point it out, it will appear.

~4 You should make a "No Passing" widget sign like the ones on those colorful cars. Because if you turn around in your game and then forget about it, you'll notice the car moving in the opposite direction.

I had a lot of fun playing this!

The level design is top notch, paths flow smoothly and intuitively. I was never confused about where the next turn would be, and the fuel pickups were a sure fire way to know a path would be risky, but doable.

The visuals are great, and the variety of levels surprised me for such a short amount of time!

The only note I feel I could add is about the camera and scoring system. As far as the scoring goes, it makes sense for the most part, but could be spelled about a bit more obviously. (Larger text/icon for you, etc.)

As for the camera, it just moves around with the car way too much. Locking its rotation and dampening its movements would absolutely fix this feeling, and make crashes more manageable. (Although they did make for a good laugh)

Other than those (very minor) notes. Well done! I had a blast and thought the usage of the theme was very well done.