Cauldrone
Cauldrones lob blobs of goo from their head. They don’t have any melee attacks, so you can safely attack them from any range.
Energy Guardian
Energy Guardians use a double clap attack when they’re close. They’re invulnerable when you have red magnetic energy active.
Muck Yuck
Muck Yucks use a sticky hand on a stretchy arm to attack enemies. When the hand hits a target, the Muck Yuck pulls itself in close for a follow-up attack.