Great work! Swordfighting mechanics are tricky, and you got a system with some good strategy in there. I think pressing in spacebar causes a parry even if I hold it down for a block, which seems OP, so I'd suggest having parry happen only if you release your spacebar shortly after pressing it, to get a little risk/reward action. Admittedly, I only tried the web version, so it may be different on the downloaded version.
But in any case, it was fun! Nicely done!