well, good try
This is a good idea, but the implementation is lacking. Your graphics need a little work, the sound is incredibly distorted, and the laws of physics are, well, ignored in some cases. Also, try upping your frame rate (to make the animation flow more smoothly) and speeding things up a bit (come on, pinball's not really that slow!).
That's not to say that your flash sucks, because it doesn't... it just needs some cleaning up. Keep at it. :)