It's cool to see someone who actualy makes an effort here. The art is really good in a general fashion, I just don't like the how the mutants look. They have no mouths and most of them have an agressive colour of skin and I find them all very ugly. This kinda brings the whole thing down for me cuz I don't like him. Animation is good but sometimes to slow, like during the fighting scene. I'd also like to point out the excessivness of the graphic violence but, this is newgrounds and people here like.
Overall, great work but, I dunno, maybe add something to the plot so that the mutants don't look so bad?