I need help making an Undertale fan game

So, I was wondering why there isn't a Dusttale fan game where you are Sans (like in Roblox's Dust Sans Simulator).  With that I started trying to make a fan game with this premise, however I'm very new to this direction as I'm just starting to learn how to use the game maker to make this game.  That's why I wanted someone who has some knowledge about scripts or arts and music for this fan game. And also my discord are zero01980