Good stuff
Nice job, really, the story was good, the sound effects were perfect, the music rocked (luv that Sephiroth theme), and the graphics were pretty good as well. The only thing that wasn't done quite so well was the fight scene between the guy that had just become evil and the original hero...a bit too confusionary. Try to make the whole thing a bit slower and the moves a bit more precise, next flash.
Keep up the good work