The sprite work on this is really impressive, especially all the attack effects! Gameplay is fun, and I appreciate that you've written out all the effects of each attack in the description.
As for the gameplay loop itself, I do feel that it needs a little more incentives for surviving. Maybe like a score/leveling system of sorts. Chaos burst does feels like it needs a little more thought into it, since most of the time it seems more like a downside when used, especially if you've already gotten the attacks you like (and also losing the ability to heal).
Overall, a really solid base you have here!