Not everyone has finished it, I'm up to the last boss now. Wish me luck everyone!
I'm not sure why, but I had the hardest time fighting the first boss in the fountainhead palace. Her overhead slash always came out a few frames faster than I expected, so it took quite a few tries before I could reliably parry. I think I fought that boss more than any other, apart from the final boss I've yet to kill.
It has been a very enjoyable game though, I have really enjoyed the fast pace combat.