I've noticed while playing that at night time or in evil biomes I'm often swarmed by lots of flying enemies, and I'm not certain if this is intended behavior. It's not uncommon for 1 demon eye to turn into 5 or 6 in the span of a few seconds. They likely don't actually spawn any more frequently than ground mobs do but because they're a little harder to hit in 3D, it's difficult to kill them fast enough to prevent a dangerous swarm from accruing, especially on harder difficulties. I do admit i have been playing on expert difficulty which could be increasing their spawn rates, but i noticed the issue in the previous version of the mod as well.
I've noticed while playing that at night time or in evil biomes I'm often swarmed by lots of flying enemies, and I'm not certain if this is intended behavior. It's not uncommon for 1 demon eye to turn into 5 or 6 in the span of a few seconds. They likely don't actually spawn any more frequently than ground mobs do but because they're a little harder to hit in 3D, it's difficult to kill them fast enough to prevent a dangerous swarm from accruing, especially on harder difficulties. I do admit i have been playing on expert difficulty which could be increasing their spawn rates, but i noticed the issue in the previous version of the mod as well.