Thanks for playing!
About blocking, it's complicated because I want the player to be able to block in any direction at any given time, so the thing that matters most is the direction you are pressing on the left stick/WASD keys to determine the direction of a block. I believe the player could get used to it after some time of playing the game so for now I'm leaving it as it is, but I'll review it further if people keep complaining about it.
I believe I've fixed the invisible harpy bug. Also glad you were able to deal with the demon! I was worried it could be too much for a first boss. In the last update I've made his hitbox bigger, so it's easier to deal damage to his weak point now be it with aerial attacks or the Sky Rend skill.
Thanks for the feedback! :D