I would suggest adding some difficulty curve if it was there I didn't notice but still I like the art and the music was very good! 

the game its ok, but maybe it is kind of slow for me,you should try yo make the car goes faster or the jump, other thing that i saw is that the art is really diferent each other, if you keep working i really think that you will be a good game maker

PS: I would like if you rate my game, I would be grateful