You're off to a good start
This is definately good work in the sense that I can tell you've learned a LOT of the flash program itself. Your timing is good, you make excellent use of the soften shapes tool and frame actions etc. I was impressed by that for sure. The problems you face are more to do with your polish. The characters are VERY reminiscent of Dragon Ball Z, something which you lose points for in my eyes, but likely gain points for in the eyes of others. More importantly though, your anatomy is attrocious, study an anatomy book, it will REALLY help with your art. Second, you have very little actual animation in the clip, most of it is anime shorthand, which is tollerable, but a few short sequences of carefully animated combat would have been helpful to your overall score. A good sequence is one that lasts for over a second without repeating the same frame at all.
Don't take this review as a criticizm, because I think you've done great on this flash, and it looks a lot better than some of mine. Also, you would probably do even better with a $150 waccom graphire or a $150 9x12 Aiptek drawing tablet. Smaller Aiptek's are even cheaper.
Good luck on your next flash! Practice Practice Practice!
PS: try not to use pop music as the background for an anime, I think it detracts from the overall quality. It would be better to use audio from the portal which fits the scene.