Any plans for more or different mods? Some general ideas:
Spiders that zig-zag
rats that stop and start some times
Bigger mobs with health bars (take multiple hits to kill)
Different schools of magic for both mobs and yourself
Mobs with resistances and weaknesses to certain elements
Multiple mobs rushing at the same time making the player need to hit all their shots to not loose hp
More attackers as the game progresses