I recommend scrolling down to the "Try it out" section, click "Start", allow camera access, then you'll see a red dot appear on the screen.

You can then move your head... it works quite well! Scroll down to the "Archery Practice Area" to try it out

Repository: https://github.com/1j01/tracky-mouse

This is really cool! Specially for the impaired.

Does anything like this exist for Mac OS without npm as a requirement? With all the recent package compromises, I'm hesitant to use anything that requires NPM.

It's built in to MacOS.

Settings > Accessibility > Pointer Control > Alternate Control Methods > Head pointer

Awesome.