Thanks for playing Feisty Fauna again! :)
I agree about Feisty difficulty being a bit spongy, that's something that I might tweak down in future versions. I haven't really balanced/played the new levels on Feisty, so watching you play at that difficulty was great feedback. I agree that some of the creatures become somewhat overpowered at that difficulty.
Regarding the spores, I've had multiple feedback about how it's confusing, so I've reworked it slightly now, where players don't have to match spore colors, and different spores give different buffs instead. Hopefully that'll make it easier to understand! Thanks for your feedback!