That looks really nice! I like the tutorial, but I wonder whether the targets up in the air can be reached? Did I miss something there?
Then I tried the boss battle. Wow, that was hard! I thought: "I really suck at these games", but then I read that others thought so too... So maybe make some easier targets for the start. The idea to first start some platformers, as usual for such games, would be good, as the movement options might fit that genre better than a pure fighting game, but I'm not sure about it. Could also be fun to jump right into fighting. And hey: you could still add some platforms to the levels: that would add cool strategic and tactic elements to the game play! There could even be some bonuses somewhere to heal etc. I think that could be a cool combo!