He's highly rad!
I love his walk, the arms are kinda a lil' staircasey.
His head seems a little square (not so much on a bright background, but on a dark background the outline is a little difficult to see and makes the head look blockier), and there are two dark pixels in the middle of his chest that disappear in a few of the frames. I'm not sure if that was intentional, but it's a little bothersome.
But those are pretty minor. It's a good sprite. Nice work!
Very clean walk animation.