You can't do what for games? Avoid complexity? You can certainly try! Some bits of complexity will creep in. The important thing is to be aware of the cost and

You can't do what for games? Avoid complexity? You can certainly try! Some bits of complexity will creep in. The important thing is to be aware of the cost and judge it appropriately, don't give low estimates for complexity-adding features. Include efforts to refactor complex stuff in the time budget. This is the same for games as other things.