Excellent Idea
Now I understand that you said that work got in the way of detail, so I will leave that alone since you already know it needs more of that, but I will give you some constructive criticism on other things I noticed.
First, speed up your action shots. The movie felt awfully slow paced at parts such as the lightning bolt flying through space when in reality one would imagine it shooting across the sky in a blur.
Second, while the music fit very well with the animation, in the future I would suggest to vary up the music, play with how loud or soft it is, etc. Music is very important when it comes to voiceless animations like this, often speaking for the characters since they can't speak themselves.
Overall, you did a wonderful job on this animation, I hope you'll remember my suggestions on your next animation! :thumbsup: