Gamemaker's scripting language: GML. It was created with GMS1 (I forget the exact version)
omg thanks so much, We have a discord server for speedrunning this game and I am trying to make a savestate/Coordinate Mod for it, there is a strat where u can go invisible and skip an entire cutscene, saving 5+ seconds, if you want, here is the discord for it! https://discord.gg/MkkkhvyBrx
also, if you wanna have the speedrun.com page of it: https://www.speedrun.com/the_red_mummy?h=Any&x=wdmo09xk
actlly no, it doesn't crash, it jst kinda softlocks, hehe, which i mean, is kinda like crashing, bt not really. also, if I wanna make the savestate/Coordinate mod, I need the code for the game, and I can't pt the game into GMS2.0, so if yo wanna DM me it, that wold be awesome. my discord is: KidoOsu#5319
the game's code is inside various objects/instances in (a version I don't have anymore of) gamemaker's script editor. If there's some way to get a different version...like, whatever re-ordered code GMS converts it to to run the game off of (if that's how it actually works? dunno) I have no idea how that is done/acquired at all. Maybe look into how people mod old GMS games like Hotline Miami?
Sorry about those soft locks! Yeah my platformers did that a lot I remember.