Funny game, I loved the sky background quickly going to stars, super exaggerated :)
It looks like the game encourages the player to slow down regularly, as you quick lose all your speed if you don't press anything. I think it would work better if the motorbike would always accelerate by default, but goes crazy with the random burst you have.
Also, I was expecting it to have the front wheel go up when it goes crazy, instead of the opposite which doesn't seem very natural (I always wanted to do back flips for some reason).
But I had fun, so good job :)