I can tell a lot of work has gone into it....
You've obviously put lots of work into this game and I vaguely remember the first Stunt Bike Draw on Newgrounds. I had to review it for a University project last year.
I must admit though, its not a very exciting idea for a game. You could have at least made the graphics look good, not just crappy gradient fills in flash. It's badly designed too. I don't know why anyone would want to play this game. Why not add an element into it where there's a bit of fun taking place, such as death sequences or jumping over spikes and fire and things that have violent consiquences to them. It's just a suggestion but I've already began making it sound more interesting! See what I mean?
Bad design, hideous artwork, poor them, no visual stimulation, not longevity and hardly any creativity means that I'm giving you a 1 and a 3. Sorry.