itch.io

I know this comment is several months old, but he used a free program called Twine to make this, it's in the game description, under "more information."

I guess by getting inspired by scenes you visually like and redesigning them in a quite different way, with other locations / protagonist and NPC-nicks, etc.? At least that's approx. how I was coding mine by imagining a video how it could be interesting to think of a game and coding referring lines that affects the game-play's story.