Pretty awesome for a first
That's pretty awesome for your first flash movie! About the only thing I found to complain about was the somewhat sub-par English; I'm assuming it's not your native language, especially since you put an Asian character on one of the bars.
The opening, for example, could say "In the heart of each of us lives a beast who feasts on spite and detestation. I'll show you which kind of beast lives inside of me." - by the way, detestation is a fairly rare word, I wasn't even sure it existed 'till I googled it. Maybe use a more common one such as 'abhorrence'? The end should be closer to "And what does your beast look like?"
As for animation, it was pretty smooth and awesome. The music fit fairly well, and it only felt a bit clunky here and there. Definitely keep animating, I personally think you will do very well in it if you keep going! ^.=.^