Cool game, but:
1) My main issue is that the difficulty curve was kind of messed up. In my opinion, level 3 was the hardest of any of them, while level 4 was pretty easy.
2) Gameplay got a little repetitive. Now, since the game is only 5 levels, it's completely fine, but if you were going to increase the scope of the game, more mechanics would be necessary. Maybe add more cars or just a whole new mechanic.
Other than that, the game was fun. The audio was really tasteful and well implemented, the art was simple but got the point across just fine, and I thought the use of the theme and focus was pretty cool.
(Also if you could give some feedback on my game too I'd appreciate it)