Overkill. Literally.
It was good for about the first minute or so. And then it got... repeditive. And predictable. There's a point where violence turns absolutely pointless and boring, and that's where bad action movies come from.
It wasn't bad, but it wasn't great, either. The animation was good, although it took some getting used to, and the music was nice. I wasn't going to finish watching it, though. But I thought maybe there would be a humorous twist. I laughed a little at the way some people died, but it wasn't too funny.
All in all, I'd give it a 5/10. Average, not to great, not bad, either. I'd say work a bit on plot and try to lessen the redundancy.