The notes at the end of the game mention taking inspiration from Slay the Princess, but they state specifically "Slay the Princess by Abby Howard," which is certainly quite odd considering Tony Howard-Arias is credited in the developers' AMA as Slay the Princess's lead writer and game designer. It would be significantly more appropriate to say "Slay the Princess by Black Tabby Games," since that is the name of the development team.
The game itself is lovely. It is quite disturbing, but I believe that is, to some degree, its purpose. Every step of every route gives a sense of disquietude, knowing very well that something dreadful will soon transpire...