I've made a bunch of games and I couldn't have done it without the combined knowledge of the GameMaker community! As thanks, I'm sharing some project files of complete games for your education and entertainment.
Note: all games are playable, but not perfect. I've only been using GMS a bit less than year, so don't expect much optimization, bug free-ness, etc. Anyway, I find looking at other people's projects interesting, so I figured others would, too :)
Link: https://cortop.itch.io/special-source-vol-1
(Sorry if this is the wrong place to post this. I wasn't sure.)