Player and boss sprites need to be different, and in my opinion melee attacks need to be made into a deeper system - most of the time it was useless except for when the boss is armorless so you can stunlock it in a corner.
Other than that, I feel like movement could be a bit more fluid, but it seems you're on the right track
Yea most people don't seem to get the melee system so I should probably rethink it to make it more intuitive or teach it in some tutorial. I had Street fighter as an inspiration for combos / hitstun. There the hitstun is pretty small for each attack, just high enough so that you can combo if you have the correct timing and use a quick enough attack to fit that hitstun window.
