One button? Kinda lame dude...
Perhaps if you could steer, and there were more tricks, ramps, and variety of ramps, this could be a winner. But as it stands, it's just very weak. Perhaps there could be 3 trick buttons (each for spin move, grab move, and flip move) coupled with the timing mechanic, and coupled once more in that you can combine 2 buttons to make an even cooler move (otherwise one could just press all 3 buttons each time, which would be cheap). Everything else was pretty good though.