Note that this is not a project that you are meant to run, but a project that provides something for you to use in YOUR projects. Click "See inside" for instructions. Make sure to read all of them! I hope I am able to help you! This is static, so you can't make scrolling games. (Unless you tinker with the code).
If you use this in your project, please give credit to @CursedByPlatformers or leave a link to this project. Check out the platformer engine I made with this: https://scratch.mit.edu/projects/88361579/