I'm bad at playing and only got up to the third boss in 20 minutes. I'll come back for more.
Game's great, I find the parrying mechanic interesting, I'll have to spend more time labbing that but I've been using the iai rising slash to get parries off since the wind up is practically instant. Feels good.
I think the problem I have with this game is how easy it is to cheese bosses into doing certain patterns. You can spam M1-Kick to wear down the bosses that I've fought so far, since M1 triggers a "counterattack" but E is fast enough to interrupt it, non-committal enough that you can dodge out of the way, and powerful enough that it ironically gives more reward in the form of posture damage than if you were to deflect normally. The third boss has a long attack string that's basically uninterruptable normally unless you parry it which is a step in the right direction, but Louise (the second boss) is easily cheesed with the aforementioned M1-Kick, if you can get behind her back you can even spam it and get a free win.
You're probably aware of this and already fixed it in some way for the later bosses. Great game, with the amount of content that you have right now I'm keeping this in my PC until I finish it