You have to dodge the small balls that is falling down!!! Steer right/left with the mouse and jump with space. It is harder to dodge if you are jumping but you are getting more points if you are. Try to beat your own score.
Edit: I agree with you guys, it is too easy. My record is 167065. I am currently working on a sequel. It is going to have a menu, sound, it will probably get harder and harder the longer you play and i will remove the jump function because it think it is pretty uneccesary. Personally i think that you can see the balls easy but because many of you have been complaining about that i'm going to change the color. Maybe i will even add special picups!