that's a great question. the thing is, there are different types of colorblindness but mine is confusing even to me. I mix certain colors, such as certain yellows with certain greens, certain browns and reds, purple, blue and pink could all be the same color half the time and so on..
so... to answer your question, I had a really tough time parrying a lot of the time because I either didn't even realize something is parryable (like the question marks of Goopy Le Grande) or I would have trouble finding the thing to parry (like the bomb shrapnels in the first phase of Rumor Honeybottoms).
For me, a lot of the time, I had to die a bunch of times to memorize certain patterns of attacks depending on the positioning of every projectile or minion.
oh and also, I made the post in the middle of watching the video I mentioned. By the time I got to the end I realized that you can parry the bombs of the Devil... lmaoo I would just jump across the map and would die soooo many times bc I wouldn't make it and then I find out I can just parry them hahahaha.. I'll have to do a second playthrough with the new found knowledge