The angle that I choose to view Homestuck through is that it is generally a story about authority on an individual, societal, and cosmic scale. A lot of the characters are defined by the way they interact with the authority in their life, and Sburb, Skaia, and Lord English all function as both a kind of loose personal authority as well as cosmic authorities. The way to "play Sburb correctly" as much as that is possible to do is to become a god and create a new universe which you can do with as you see fit. It is reflective in some sense of the transition from childhood to adulthood, although the story makes it clear that that transition is not always clearly defined, always desirable, or free of its own many, many dramas and arbitrary restrictions.