Average
Not a bad effort, but nothing about it distinguished it from the many other violence based animations. There wasnt anything particularly bad about it but it fell into the plot trap these kinds of animations fall into:
An unbeatable main character kills lots of nameless bad guys, all of whom cant fight for love nor money, often with no explanation. Then they fight a sub boss who gives them some trouble but they still kill and then the main boss who proceeds to kick their ass until a convenient plot device grants them victory.
However i like the idea you are taking suggestions on plot, so im hopeful the next installment will break out of the mould and be something unique and notable.