Great game!!
I tried to complete the platforming section with the two girls as intended, and the jumping moments were truly challenging. If I understood correctly, you had to switch from the zombie to the witch mid-jump to allow her to reach the higher platform?
I'm not sure if it was a bug, but right after being revived, the zombie girl jumped much lower than usual.
Sadly the witch couldn't be used at all during the boss attack. No matter how hard I tried, no damage was dealt.