Dude, did you even playtest this?
Do you seriously expect me to sit here manually drawing 100+ pentagrams?
Hey, glad you tried it! Well, you actually need only first ten pentagrams to draw. Then you have enough Essence to summon first entity, which will gather Essence on it's own. And after defeating first city, you'll get Dominion, which will speed up your progress (even from drawing pentagrams). I know it's little tedious, but this is game about summoning demons - how do you want to do it without drawing a pentagram on a floor?