Oh wow, I forgot to merge it back into master, the code was still on the initialImplementation branch, thanks for pointing that out! It's back on master now, it should show up.
I'm not sure if there's much to learn from Storm Storm's code, since it was my first Vectrex game. I should also point out that some of it is in my wrapper library prism https://github.com/CaptainDreamcast/prism/tree/develop/vectrex where I keep stuff that I think might come handy when making another game (though I haven't come around to doing something for Vectrex again yet).
Either way, I hope you are successful with your Vectrex aspirations!