Nice
That was a nice twist with the axe-wielding sphere. Where as some people say it needs blood, I would like to plead to not use blood. Even though it is 'realistic', it's really overused in NG in my opinion. Like the whole part when the sphere guy hits his head, the way the head deformed was good, added a comedic value. Blood would of taken away from that. It's your choice to use blood, but I would recommend against it.
Other suggestion is that the joints look jagged at some points, where is looks more like two 2X4's nailed together instead of an actual joint. I think there are some good sugestions already down below.
Hope ya don't mind the essay.