Once you get the basic strategy, all the levels play the same. Rush massive slaves, slaves+archers, soldiers+archers as you level, then spam assassins with your hero out. Bring out catapult, spam infernals and spiders.
best build: Cursed Golem. Focus on stamina, before floor 15, keep 1 set of gear for each element. Use VINES spell!!! VINES is the only spell that will selectively agro. Only the creatures IN the circle will attack not the nearby ones. Use this to pick them off until floor 25/30 at which point you should have found enough gear to have 90% + resistances to all elements. Focus on will then just walk into a room charm 2 or 3 or so, then start killing. You'll be shooting people in the face like Dick Cheney until you get bored. (I got bored around 20th though I could have ran that forever).
Every level is easily winnable by digging out huge swaths straight to the spawn point and building a TON in a straight line. This keeps flying units from avoiding your D. Mazing does nothing for this game...
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Only if you have a leader will it find it ... you make leaders by gathering your people at waypoints :D