Hello Skinner Space.
I commented on this game about a year ago asking for some advice on the Raycasting Game Maker, and asked if I could use Cornflakestein as an example in a tutorial guide I was creating. The tutorial never became a video series as originally intended, but it is now a fully fledged PDF guide which I just posted to my Itch page. Your game is one of 12 RGM titles that is featured throughout.
Thank you again.
Here is a link to the finished guide: https://filmgamerj.itch.io/guide-to-raycasting-game-maker