I agree with what Dusty's saying - my biggest issue with the animation is that, for me at least, it reads as if he's moving his legs in parallel with his arms (IE when his left leg is forward, his left arm is too, and not his right one). I realise that the kneepads are coloured differently, but it's hard to make out in motion, especially since the pants are solid black, and the outlines seem to be more or less the same for both legs. It also looks off to me how the outline of his hair never changes even though he is clearly moving and turning his head.
The animation isn't without flaws but the foundation is definitely there. With some touching up I think this could be pretty great.