Sorry about that, I do plan on rebalancing a lot of fights. I was pressed for time and ended up making mistakes with some of the fights, especially by introducing too much at once and not properly explaining some mechanics. Fairies in partcular absorb green spells, so you might have been healing her accidentally.
Thank you! There's definitely work left to do. I also plan to add an easy mode eventually.
In the meantime though, the walkthrough does have both general and monsterg dependent tips!
https://www.patreon.com/posts/92141393