What about a kill all enemies(Kae) category, like in this tas video: does somebody tried it to play it like this?

I think that belongs in a CE if they ever make one for this game. I just don’t see it becoming a main category.

^this

And as for my personal opinion: while such kill/collect all categories are certainly fun to watch in a TAS video, they tend to be a drag to do RTA. This one doesn't seem appealing to me at all. It'd be more of a challenge run than a speedrun in practice.