It turns out I had to platform like a god at the Ginso Tree because I was missing two abilities. Oh my god, I ragequit for a year. I've backtracked and now learned dash and airdash. Back in it!
Level 50! Unlocked some hidden music stages in effect mode! I've been practicing and finally survived 30 lines in speed 15. I finally have a shot at finishing 'Metamorphosis' in the Normal setting.