Critical Review for Improvement
Before this, there wasn't much actual animation in these. However, when things were moving in this one, it was rather confused and difficult to follow. The timing needs a bit work, my eyes had trouble interpreting movement. If you want things to move quickly, you need to stretch the forms out otherwise they flicker and you lose the viewer.
The movement felt pretty stiff in some places, the posing was pretty good most of the time, but you don't want to mindlessly draw the inbetweens. Remember the animation principals of easing in and out and overlapping the action, they're the keys to giving a character life. It's easy to get wrapped up in drawing the details, so if you block the action in with scribbled gesture drawings first, you can use that as an armature for the details.
You have obviously been influenced by anime, whic is fine, but it isn't the best thing to use for character animation reference as it usually uses limited animation (all of the television series do, anyway). You seem to be pretty comfortable with drawing your characters, so some good reference would be the old 1940's theatrical shorts, like Bugs Bunny and Tom & Jerry. If you can adopt the same vitality those cartoons have into the angular anime style, you'll be set to work for Miazaki! :D
Keep practicing, good luck!