Beautiful art, great idea.
Nitpicks: Why this control scheme? Why mouse click, instead of any other button, if you can't contro lthe parry direction with it?
The controls feel a bit floaty.
I really do not like that the enemies swords glint, and then 0.25 seconds later you have to parry, instead of right after the glint.
You can both parry and get hit by an arrow.