HOW TO USE ENGINE: 1. Remix the project. 2. Look at the sprites. You will see a sprite called "Charting." 3. Go to sounds and you will see a sound called "REPLACE WITH AUDIO". Copy and paste your song into there. 4. Go back to code. You will create clones of "Up, Down, Left, and Right". These clone blocks will spawn the arrows. 5. You've made a level!
spam first then win thx @SuperSonicStudio