It's an attack that Branno had us make to attack the enemies. It doesn't have a health to despawn, but rather it despawns after a certain distance off screen.

I just updated the page with a link to the introductory video of the project.

You're welcome! This is a perfect follow along to get an understanding of learning the basics of godot. You will always have the code you write and projects you make to look back on, remember that!