nice flash, but instead of shouting my head off like an idiot about how good it is in 2 words, ill give you some things to look at.
in the first part, i really liked the flash, nice effects there, but the music was too loud, you should put that down. its the voice you want to hear, because that is telling the/an story. the music comes later on.
its cool if you can do 3d, but it doesn't fit this animation, it just doesn't mix with eachother, not this way. the part that he is running building to building, some parts i just hated that you used that background. it doesn't match.
some guy sad it before, the characters look generic, keep in mind that it is the main character's story you'r telling, so he's allways in vieuw. make sure you make an art of him and the other main characters. that sure would pump it up!
maybe the story doen't seen very new, but its only the beginning, thats the nice thing of it al, you always can do something different:) its your work, people who think they know the story allready... yeah, we'll see when its done:)
well, thats for now, i nice flash, but if you look into a few points it could be better. good luck!