Gore kills the story
I felt that the movie was spoilt by the amount of gore in it. It had the potential to be a slightly above average piece, but since it gives in to what seems to be Newgrounds moto: "gore or sex = automatically good" it turned out to be ordinary instead.
It brings nothing new to the table. There's already hundreds of movies that depict pointless acts of violence in various levels of detail. I feel that the story could have been just as effectively told without the graphic depictions in it, and therefore they serve no purpose. The sound was slightly below average to average.
Having said that, your character designs are pretty good. You seem to have talent with using Flash, and if combined with a good story idea, soundtrack and well balanced characters, your work could greatly improve. Not bad, not amazing, 5/10.