Thanks :)
I agree with you about the platforming controls. I made this prototype a while back, but i'm currently working on a new version of K438-B that already has the tricks you mentionned in the video, and this greatly improves the controls. Helpfull video!! There's another interesting trick you did not talk about, it's the gravity on top of a jump, lowering the gravity during few ms gives player time to handle the reception. But you probably already knows it, creators of celeste gives a lot of their tricks.