Nice movie dude.
Congrats for the daily award.
The graphics were nice, the fight scenes were intense and the effects you do are damn good.
But I think the voice acting and the sound effect are fake and weak.
For your un-sync bug, I'd say 2 things...instead of asking the viewers to pause and restart the movie, I suggest you simply put a keyframe with the action stop(); play(); somewhere in the movie where the sound start to be un-sync or just before. I also think this is a flash bug...once a stream sound ends...the other sounds play before they should even when they are at the right place on the timeline, to solve this I use a stream "silence sound" that cover the entine animation...putting this sound's quality at the lowest will only add like 30k to a long movie and you won't have to worry about syncing the sounds to your animation. Hope that helped. Keep it up.