Great game concept! It's a bit rough around the edges though. Can't seem to figure out how to rotate camera or rotate cell placement if that's a feature. If not it probably should be. I'm not expecting full Dungeon Keeper with traps, and attacking heroes but would like to be able to build the place to be better looking lol.
I like that the theme is breeding a monster army. Would like to see better birth animations with possibly umbilical cords, and what not. And more things to do with those monsters like being able to raid for food as others suggested. Maybe there could be a basic world map even where you choose where to raid, and could take casualties. Would be more interesting than the current quests in my opinion.
Oh, and I really hope the story is eventually the Wizard taking over, and killing the annoying Warlord, and Shaman.