Australian Ben Porter has been building the invader of his dreams for the past 2 years as a strange world of molluscs skeletons and walking trees, and since he also has a PHD in procedurally generating stuff, the cavern worlds should also be ProcGen'd as well right? Moonman is a curious mash up of styles with elements of Minecraft, Tererria, Binding of Issac, Spelunky and George Orwell's Animal Farm (!)