Gave it another go.
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Thanks for trying it out again.
Yeah, there's like 2 or 3 more bosses that you're supposed to fight before that last one, and it's also meant to feel impossible as part of the story.
I also realized I haven't updated some of the skill selection text in a long time, and that one about impurities was back when I was trying to give it more of a lore description rather than a gameplay one, although it's also not a bad idea to make it recover status effects since there aren't any options for that right now. Apart from the tutorial, there's no place where the player is forced into being exposed to the descriptions, so I'm thinking that I can make the player have to select their slot assignments manually first to let them know that the descriptions are there.
Slide kick is meant to be more for mobility, so the damage isn't great. But the recent changes to the camera and directions also make it impossible to line up.
For the charged skills, you only need to hold it until the twinkle effect shows up, then you can release it early. This fuzziness lets you hold attacks out a little longer for timing parries.
That parry at the end of her spin wasn't intentional, turns out I forgot to set the flag for preventing that. Sorry.
Also, here's a video of me beating the last boss. The reactions get pretty absurd towards the end, so I'll still need to tweak that logic some more, but this is how the skills are meant to be used.