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The most difficult part of creating a game for me is creating an unknown system. This is because I cannot predict how long it will take. And I try to postpone content that builds on top of an already completed system because I can predict how long it will take. Then, when the system is mostly done, I can finally start producing the overall content.
Well, yes, of course. I didn't mean to say that drawing is the one holding him down. I was just making an example that creative work (like drawing, game developing, composing, etc) is affected by the mood or emotion of the person doing it, unlike office work or any other work that doesn't need creativity.