You can replace characters by going into their costumes and replacing the poses with your characters' poses. You can also change some of the animation code if you want it to look different. But not just that! You also can customize the note skins and add whatever you want to it! Events, more people, shenanigans, anything! I've also left a bunch of comments lying around to help you out (if you need it)
original project: https://scratch.mit.edu/projects/823306078/ I felt like remastering this because it was @scratchinfnf @KingFinnn @-Dominoes-