Ball fighter, about 11 years ago, when I was 11. I actually have the game on my itch profile.
It was pretty bad. It took me weeks to make, can be beaten in 5 seconds and it's a buggy mess. I'm actually just recently working on the 3D sequel, but making it in Unity.
I also made a bunch of other various stuff in GameMaker at the time, but I never published them. I remember I made "Harry Potter and the Sorcerer's Stone," which opens up with you running away from Uncle Vernon to catch your letter from Hogwarts. The graphics were atrocious.