An enjoyable little RAAAGE...
...game.
My only feedback is to raise all the speed-related numbers in your code. It feels a bit too slow at the moment, like it is playing in slow-motion.
Being able to launch a little before all movement/sliding has finished would make it even more fun and smooth too, though this could be difficult to implement.
Excellent work with this ga- GET. no. GET U!- NO DONT FAL- goddangit. STAHP- no. ok. i can do it this time. GE- uhhhhh. NO! ooooh... ... ... K!!!!-yes. did it. finally. ok *phew* next stage...