Here's an interesting fact that I will constantly spread. Mama Rabbit's retirement certificate references a bakery. Said bakery is actually from two deleted games. I think you know its prequel as The Bit More Know Zero. The first game had nothing to do with it (yet) whilst the second game takes place to where she worked. Said sequel also feels like the precursor to Beware the Shadowcatcher. You might think I may be lying, but I currently have both games with me. If I have time, I would send a video link for the second deleted game. (I'm not playing the 1st one. Too terrifying for me lol)
Why do i bring it up? Well, because if we took account to the games being in the same universe, it all dates back to his very first game.