Most of the suggestions I would make have already been mentioned, save one. It took me a while to realize that the camera control was mapped to the arrow keys instead of the mouse. So my only recommendation (other than "make more content for this cool world!") would be to impliment the classic WASD for movement, and mouse for look.
You've definitely got the best animation and rigging I've seen. Definitely one of the most cohesive art styles as well. Seems to me like you could use a developer to hook everything up while you make the good looking bits... If you ever need that guy, hmu ;)