I'm amazed by how many levels you've made! It's also a really cool concept and it has a nice flow because of the immediate restart. I do like the background a lot, and it generally looks pretty good and gamboy-ish. While I could sometimes solve the level without solving it the intended way, it didn't feel broken, but more like a valid alternative.
The only thing I'm not too sure about would be that the disc disappears instantly, that was a bit confusing at first. I feel like it could have worked with a disk that quickly comes back as well, or maybe a little effect when the disc disappears. But that's just nit picking, really. It's a great game, especially for a jam!