Interview with Pat McHale (Adventure Time, Over the Garden Wall writer)
I think whenever you write something you want people to like it. The best way to do that, usually, is to write what you think is good. That’s basically what everyone tries to do… just to write what they think is good. Part of that is staying true to the characters and the world (which makes it a kids show by it’s design)… and part of that is introducing deeper concepts that we, as writers, are curious about exploring (which makes it more interesting for adults).