An incredibly boring gif here, but it's just the very early beginnings of a procedural level generation system where the game reads information out of a datastructure that then determines where to place down a floor. I'm basically trying to re-create Spelunky's level creation here, but with a different end-goal in mind. The main reason why I'm doing this however, is to get a bit more comfortable with Game Maker's data structures, which is something I barely use, but I feel would help me a lot if I had a better understanding of.
Also if you want to see me be confused for several hours while making this, I streamed the whole thing.