I went through the entire game and all the extra missions as a caster, though it quickly became just a melee fighter with spell procs and a shield spell. Had to hunt down damage reduction and status immunity gear to stand a chance, then sit there for ~15 rounds auto-attacking each time. I hope the knight at least can go through things faster? I would suggest removing that nasty HP bonus from the 'Might' enemy enchantment, the damage bonus is hefty enough to be going on with.
The delay in attack speed caused by auto-procs became annoying when my character would sit there turning the same monster into a chicken for four or five rounds solid. I really think my major complaint about this is that fights take forever and I'm basically sitting there waiting for passives to proc or spamming potions until they do. The meteor and magic missile cost the equivalent of 20 and 10 auto-attack rounds of MP recovery, and you can't stack up MP-gain gear when you need every piece of '- enemy damage' you can find.
Finally, it'd be nice if there were something that happened when you beat the last Act aside from stuff just vaguely dropping off. Tried clearing all the hard and impossible modes, got nothing plot-wise either. Does it just end here? I might have missed something too, half my achievements weren't even registering near the end, even state-based things like gaining level 20.
I suppose it's too late to ask you to develop further plot on a year-old game... sorry we won't eventually find out exactly what's going on. Thank you for bringing this over from Armor Games, all the same.