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So, I have replayed the game just to be sure I was correct and yeah, I totally beat the third boss easy, though now I know where to get all the items, so the second boss was pretty easy as well.

My trick was not worrying about trying to get up there as best you can, instead trying to get into a pattern of jumping from left to right. In most cases, the white balls will be either on the left OR the right and the bull's attacks are very predictable. What helped me as well, was jumping near the end of every one of the bulls attacks so he reappears in the row above me and I can focus on avoiding the white balls.

It took me a few times to get into the groove. When I did find myself in a position where I'd get hit by something, I turn so I fall back towards most of the platform and not all the way to the ground. If you do fall though, don't try to clamber up as fast as you can, because that'll get you panicking and in trouble!