Well...
Shaggy lines, poor audio optimization, lack of color, low framerate.
Shaggy Lines: Your art is not bad, but it seriously needs a lot of polishing on your part, since right now it looks like Generic Begginer Manga 1.0. Round, softer lines must be used, also, activate the pressure control option on flash so that you achieve a sleek look on your lines.
Poor audio optimization: Just because it's a test doesn't mean that for the next time you can't avoid using sound so recklessly. The music was too loud and the sounds were either louder or at the same level that the music, and that just creates a mess of soundwaves that's just a pain on the ears. Next time, try lowering the volume according to the sound effect/background music you're going to use, this is vital for a succesful movie.
Lack of color: Self explanatory, really. Next time try drawing everything black and white, and then paint every frame that you made.
Low framerate: This is also self explanatory, increasing the framerate means a lot more work on drawings, but it'll also improve your animation a LOT. 30 frames per second, even 27, is a good quantity.