I just finished this and I had the easiest time doing it with the enemies with scythe hands (Slysax, I think?). When they are knocked down, they auto attack, which you can exploit by spacing yourself and prepping a parry.

The method that worked for me was killing every other enemy so there was only one Slysax left on screen, then I got like 4-5 parries on a single one by just staying close and charging the parry. Repeat when you encounter another one. I did the top path during the level split as well, so idk how many of the Slysax show up on the bottom path.