Hey Shaun, first of all thanks for the great tutorials you make. I started using GML last December and this series have been the best intro to GMS2 ever. So much that, based on this code, I created my first game and submitted to a GameJam, here's a link if you wanna check: https://ak1r4.itch.io/the-legend-of-prisma
It's very rough on the edges, and I coded some other functions, but the base code comes from here.
Lastly, it's not like I want to promote my game, but maybe the last episode of the series could be a showcase of what viewers and patreons have made with the ARPG tutorials, I think it would extremely motivating for viewers that started watching the series recently. Cheers!