This project is a port of Celeste Classic to the Game Maker Studio 2.
The entire game can be played using the room rmOriginalGame, but you can make your custom levels with the Gamemaker room Editor if you adapt the code properly.
Original game credits:
Matt Thorson - design and audio mattmakesgames.com
Noel Berry - code and art noelfb.com
https://verdini.github.io/celeste-classic-web/
Also, the original game can be played by clicking the following link: https://mattmakesgames.itch.io/celesteclassic