Feel free to make the changes you need. The current categorisations are:
Javlineer - 3x3 wanderer. Could be a sniper, but is intended as a source of mobile, long-range pressure.
Ankle Biter - 1x1 local guard. A little beast who wants to hug you with teeth. The dead-zone in-front is actually quite large, so I was considering adding a short-ranged death explosion, especially if its weapon range is increased further. Tweak range by either by adding more bullets (more work), or tweaking the speed and angle settings (less work).
Cold Mage (name change?) - 5x5 Attacker. Meant to be a top tier 5x5, like the 7x7 Flak launcher, but with introductory forms on lower floors that are far more manageable. Has its three attacks, one of which is its signature spell borrowed from Diablo 2. I've noticed that the category of the Frozen Orb (EnemyFamiliar) can spawn health drops at a very low probability, so this is a potential exploit. Note sure how to fix.