First of all, I like the simple but clean graphics. I think the game could be fun, if you would fix some stuff. So far it is really hard to control the car and get to the first platform even. For example, when you reset, the velocity of the car doesn't, so it just goes off and falls again. So yeah, a few tweaks and it would be a cool game, I think :)
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It was a bit easyier but still pretty hard.
I think, what someone else wrote, that it should be possible to control the height of the jump, by pressing the jump button longer or shorter, would make it quite better! Also I think there is a bug, where the boost timer doesn't reset, when you press R. So you sometimes have to wait until you can use it after you restarted.