Up after some sleep to start and decided to do something very basic to account for my lack of time this weekend. Somehow this translated in my head to "Hey let's start by trying to create a lighting system in GameMaker Studio". What.

Still some issues with it (spot the dodgy light going through seams in objects), but I'm surprised how quickly that came together (with the aid of a few tutorials, as I've never done it before). Now to actually make a game.