Great job! Thanks for going through the hassle of code signing.
I find myself wanting to keep it running in a corner of the screen. An option to "keep window on top" and a way to "snap" the window to the correct aspect ratio would be welcome.
When you share the source you can tell me to submit a patch. :-)
A long time ago I created a buggy reimplementation of the Flying Toasters screen saver for macOS. Noodling with this may inspire me to get that updated.