Man that was sick! Your actually one of my favourite beginners, you got a powerful style and you animate fun ideas.
As for things that could be improved: First off I have to say the blood was actually really well done, I would say maybe add a bit more particles that fly into the air on the first slash and then drop down or disappear, make them travel in the direction of sword as
it makes contact with arm (I am not saying make the particles fly in the sword swinging arc, just in a straight line from the direction the cut was made, so maybe up and a bit to the right). The walking at the end was pretty slack, it all got a bit abrupt and rough looking. I liked the reaction, except for the torso as it was cut off, it maybe went a bit further to the right than it should have.
Overall I'm really impressed, just something about your style that I love. Keep making more, and smooth those movements out and you'll be golden