Hi Schmidt,
So I originally commented on Catacombs about a year ago to ask if I could use it as an example in a tutorial guide I was creating for the Raycasting Game Maker. It didn't end up becoming a video series as originally intended, but it is now a 118 page PDF guide book and includes every last detail and trick I could think of.
Catacombs of the Necromancer makes several key appearances as examples of different features and tricks, so I wanted to thank you again for allowing its inclusion.
Here is a link to the finished guide: https://filmgamerj.itch.io/guide-to-raycasting-game-maker