Fun and challenging! I feel like a turn counter somewhere would help, as I kept getting lost on what turn it was, and counting the number of turns total to myself didn't do me much favors. Otherwise nice job!
I experimented with a turn counter, but it made the game too easy. If I spent more time on the game instead of being lazy, I could have made it into a rythm game instead, so the challenge would come from attacking/parrying on beat, rather than remembering the count.