I really enjoyed playing this, but there were a few things that bothered me.
I understand that, with the way you have the game now, it is necasary to be able to replay levels, otherwise you wouldn't get a second weapon until level 15, but it just made it too easy.
The drifting was nice, it made it more difficult and more realistic (if that even matters).
Overall, i thought this game was too easy, i beat it without dying, and found that with enough armor, you can beat most levels without even moving.
But it was still very fun, keep up the good work :)