hmm...
Very few serious users go along without actually reading just a couple sentences of the FAQ. I didn't go through the whole FAQ, but figuring out how to whistle and other stuff took me some time.
Flashwise, something like this isn't hard at all to imitate or make better. Just stopping frames and buttons. You also screwed up with the stage size. Did you change the stage size last minute, or were you unaware that everything was bigger than the stage? Anyway, better than your average work. I give a five.