Star Iron, building an empire starting with game development

A young man is forced to travel to an icy planet and dies of hypothermia. He is then found and rescued by a wandering god. Perhaps due to the god's twisted sense of humor, the young man is forced to become the female protagonist of a recently played game, starting with a system. He embarks on an arms race in the world of Star Railway under the guise of game development, then uses Star Railway as a center to expand into other universes and establish a vast, multiverse empire...