I followed Dulfy’s guide, and I’m on crystal 6, and when I ‘jump down’ to that lower platform, I hit the platform (hurray for my sorta ok non-time-sensitive jumping skills!) but then I die. Apparently my paltry 17,442 health just isn’t enough.
Is there an alternate path for 6? 
Nevermind! I think I got it. There’s a double-jump to get to one on a bamboo ‘thing’ below, and from the top of that, you can jump over to the platform to do 6 and 7.
(edited by notebene.3190)