I couldn't really figure out the timing on the parry, it felt like the window was shorter then the animation which just felt off. I also was confused by the hitbox of the parry, since sometimes things just flew by me, but it could just be the sword being so big that threw me off.
The randomness and bouncing platform are interesting ideas, but it unfortunately doesn't seem to work well here. Sometimes things would spam so close I would be hit before I could even do anything, and other times I would just sit around waiting for something to line up so I could do anything.
A game about parrying is a cool idea, but I don't find it very enjoyable currently.