It's very very good, and as a fan of Zero, I enjoy seeing this animated. One criticism I would offer though, is that the characters have strange proportions in this animation, making them look like children. I would love to see you continue this though; it's all very well done. Lastly, this is not a criticism but a suggestion: perhaps include (even just stills of) a battle at the end. There was a very nice rise of tension, especially towards the end, that was left unresolved and could have been treated very well by a small battle scene. All in all, a great piece of animation. Put more strongly; I don't know where your interests lie, but consider a career in animation. Anyway, well done, and I would like to see more.