A few hints and tips for you
Alright, so kudos for making your first attempt at a flash submission. I can't vote it any higher, but that's only because you're not up to a high standard yet. With time and effort, you can certainly do just that though.
I'd suggest you start with looking over some tutorials about triggering the music, when you press play. From there, I'd also suggest that you find a piece of music which is better suited for theme and for length to the animation. Get yourself into an area where you can cut 10-15 seconds, or even stretch the animation out a little to make the ends meet.
On top of that, you have stickmen. This isn't all that bad, but they aren't animated very well. Search for Xiao Xiao and see some fine examples of sticks, that you may gain some inspiration from. Then, when drawing, zoom in and tidy them all up, before you animate them. Suddenly, the piece looks a lot better.
Subtitles should be displayed across the bottom of the screen, for the ease of reading by the viewer. Consider having them typed, so that we can understand them quicker. Failing that, get yourself a voice actor, who can give you great samples to work with. From there, you'll have a much better looking and sounding piece, which should bring you good reviews.
Once that's in place, a plot should be the next main thing to focus on. Since yours does not have one, it's alright at present, since you are mainly using this for practice, but progress will require that you come up with decent short movies, compelling games, or even funny series of toons that people will like. Feel free to check out the Writing Forum, to see if there are any pieces in there that you either like, or will inspire you toward your next piece.
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