Any helpful hints on how to get even close to this amount?

Excuse me but how amazing is this? Just as we are waiting for the new William and Sly game that is going to be published on here, being able to play this collection bundle of both of these games feels surreal. Thank you Lucas Paakh, for everything.

Some darklings are very far from rune stones, making it difficult to kill them. Is it possible to re-activate the white magic, or there is only one chance?

How you kill them?

I can only find 174/176 mushrooms. I've been using this guide https://www.newgrounds.com/art/view/wylo/william-and-sly-item-map and I checked literally everywhere there was a pink pixel and couldn't find the last two. I have all chests opened and 12/15 shadows destroyed. Are some of the underground ones missable if you move a certain way? Is the map incomplete?...