That one part w the switches over the lava where you have to uppercut them is completely brutal. 

you can  skip some of them by just uppercutting at the low point of your jump to extend your jump to the next one of the same colour.

I never had much issue with it, unless youre getting knocked into the molten chocolate by the fairy in which case i cant really help

That and long repetitive mid air switching platform thingie.

Loved the witch fight btw.