You don't continue to parry for the entire jump, you only parry for about one second, so don't just double tap jump, you have to time it right before you hit it

There's not a specific angle. Just be sure to press the button when you're in the radius of the object.

But, you have to jump on them - or to be more precise from above right ? Or is it possible to jump from underneath and time the second button hit ?

50% of the time i do this i get hit, i dunno why. (yes, im hitting the pink objects)

But it dosn't do it all smoothly like, I can only do one parry or two but not all 3 in a row jumping all around

Giving them a little slap might help.

Sorry, unable to slap. Before I started the game, both cuphead and mugman's liquid fell out of their heads, leading to them dying, permanantly. Any fixes?

John, the problem is that parries don't give you invulnerability and they should fix that. At expert difficulty you almost die evrytime for a parry after-effect

Well.. i guess you just have to practice

Listen dude, my name isn't Dean Takahashi. I know to parry the pink objects.