I must say, the sprites are impressive. What's more impressive is that you can even make that she looks like a firebender and waterbender with a correct color palette on the effect.
This is purely my opinion, but it'd be better if there are small pauses (or perhaps more in-between sprites) for smoother and more natural animation. I think the current animations seem to bit rushing. But again, this is only my opinion.
I also noticed that in the "Melon Lord" hyper, the meteors' shadows are moving up after the meteors going below the screen.