Have you downloaded the patch d1.2.1? This battle is now easier compared to the last patch
Viewing post in Burning Horns - A Bara Isekai JRPG [v1.0.6b] comments
Maybe the fights are now a bit too easy since I can defeat them without any risk of defeat. Actually usually before they get more than one of their "songs" off... though I guess the satyrs themselves are supposed to be buffbots for the other critters.
It's just that the plant-thing dies on first round and in the catacomps it's maybe one more turn more before the critters protecting the satyr are down.