It is a mouse trail! The soccer ball follows your mouse. You can also score goals by touching the Touch me thing. You have to wait until no parts of the soccer ball are touching the text and then you can score another goal.
I want to dedicate this to anyone who likes soccer. I'm not much of a soccer fan myself, though. I'm terrible at offense, not that good at defense, and a pretty average beginner goalie | -.- https://scratch.mit.edu/projects/131891762/ I learned how to make a mouse trail there.