You're on the right track...
but I think there should be more of a point. For example, instead of constantly on a ramp, you could be on the street, pulling moves while jumping off ramps, dodgeing cops and cars and even hitting into random people to get a higher score while busting a kickflip or something. There should also be grind rails as well that you can jump on/off and pull a move as you are jumping. At the end of each level, there would be a halfpipe that you would have to bust tricks in a time limit. By the way, it should be easier to fall. I was able to pull off moves where in other games you would fall.