I really liked the no weapons fight, because it made me feel that it really was the most important mission, as in they weren't even prepared for it, but they threw their lives at it with all they've got, courage. The lack of faces also turned my feelings that way.
The only problem I experienced was when the old crystal individual was showing the visions to the rest of his people, I couldn't always figure out, what the image was, I think because it was all in one color.