Instructions are in the project New feature for my projects! My projects are now mobile-friendly, just press the Mode button at the bottom right to switch to the next mode. These modes, in order when the green flag is pressed, are Stop (Playing nothing), Playing Once, and Playing forever. When the button is pressed, it changes to the next mode and cycles when it reaches the end, so it can be pressed an infinite number of times.
I got the music from Geometry Dash World (which the level is also really good) and I did all art and scripts in the project. If there are any bugs, tell me so I can fix them.