As a gamer in my 40s, I almost never complain about a game being too short. That said, this one did leave me wanting to see/learn more. But it is a compelling premise: This kind of interaction is precisely what is left unsaid in almost every action game.
UPDATE: I think that I was overtired when I played this game last night. I was ruminating over the ending (or, at least, the ending that I got) this morning, and I think that I finally understood it. Whoa.