Thanks! Yes, some more tutorialisation or an easy mode or something would have been a big improvement and was high on our list of things to add if we had more time.
The wave speed was dependent on the bpm of the music, and should have aligned ideally?
Re "four kicks happening simultaneously on both sides" - the slam attack (x on keyboard) should do the larger wave pattern which it sounds like you might be describing, and facing forwards (down arrow on keyboard) allows you to attack both sides at once. I'm not sure if that's the issue you are having there though.
Yes, ideally some sort of healing mechanism would have been nice, it was a little too ambitious in scope given the time we had available to work on this but I do agree that it could have benefited the game because an early mistake wouldn't have felt as catastrophic.
Thanks for playing and for all your helpful feedback!