Holy shit. I'd forgotten a lot about this animation. Seeing it again I only now see how impressive this was for its time, and how impressive it still is today. The simplistic art style is at points intentional, I think, given the rough brushstrokes and lack of smooth edges, and it sometimes gave this a very artsy look while at other times coming across as being comically bad. The sound effects and soundtrack are really well-picked, and not nearly as redundant as most animations of this era. Moreover, you have a great mix of comedy and action, and it's impressively long as well.
Finally I want to give special credit to all the effects in this animation. Stuff like the masking as it appeared in the credits gave this a sense of polish, while slight instances of fullbody animation, slow-motion, and perspective were wonderful. Overall I did feel as if this animation was lacking smoothness in general movements and particles such as blood, but this paled in comparison to the overarching animation here. This does a really incredible job of straddling the old-school Newgrounds animation style and professionally filmmaking.