Great level design. Last levels were so hard I thought I was missing dash or triple jump :D
And then I thought "If there was death counter, I would have a few hundred". And I was right :) (254 - can't paste screenshot)
No idea where the 8th item was though.
Plain white and black are a bit tiring for the eyes. Iit's very hard to come up with nice 1 bit palette, I'd just steal one from Obra Dinn ;)