Rob Milus isn’t saying much, but it’s enough. He’s working on a game called Ekko with fellow game maker Peter Dijkstra, one that he’s only showed glimpses of on Twitter—abstract shapes floating across a space lit by a distant sun. I wanted to find out more, a lot more, but he only responded with a few sentences and a finger raised to his lips. “Shhhh.” Of what Milus told me and that I can share with you, it is that Ekko started off as an interest in the theory of the butterfly effect: “how a small change in one place can evolve…