Nice first attempt!
For a first attempt, this appears to be fairly solid. There's no stick figures (Hurrah! :D) and it's colorful. The animation is a bit primitive, but you'll work through that with some sweat and experience.
On a good note, everything was very colorful, and the drawing were decent. What I really thought was cool, however, his the way the flash flowed with the music; when the protaganist (?) shed a tear the music began to pick up as if he were battling with inner turmoil. Probably unintentional, but very cool!
There are things to improve as well. The animation is quite rough. As has been previously said, I believe more keyframes and pumping up the fps should help. I understand that this was just a quick attempt, but why not submit something until it is the best it could be? If you do that, you'll find yourself greeted with some surprising results! (In a good way) The music also was too long for the flash. I don't know if there is a way you could make it fade out with flash, but that would be helpful.
Not a bad job at all for a beginner. Spend more time paying attention to details, read some tutorials, and keep working at it despite what anyone may say. :)
~Blaze
PS. Thanks for using my song! ^_^