Great animation, fun little story, and held my interest throughout its entirety. If there were any critisism to give, it would be with the voices. It's good that you provided word balloons, because those voices were unintelligable, sounding like down syndrome patients. If you did that on purpose, I feel that was a mistake, because it didn't seem to fit the characters at all.
If you were to fix the voices if you do a sequel (which would be most welcome), that would benefit your flash that much more.