This game is quite fun. This game actually started a secondary friendship. My bro became friends with this other guy and, by the transitive property of siblings, we are now good friends.
What's your personal style when playing this game? I generally collect every djinn and keep it with its respective hero (earth-Isaac, etc), and save up mah moneh to get new weapons and armor every once in a while, meaning every three or four towns. I power train before the secret boss and always collect every djinn.
When's the third game coming out... still several loose ends.