It was just always work to clean it up and make a website and export the code to git. It was everyone working on it for the last few weeks, it was way more work than I wanted it to be.

The other aspect was that I wanted the language design to settle down before open sourcing it. I wasn't interested in a "design by internet" language, my experience is that stuff that comes out of one mind tends to hang together better. I probably waited longer than I needed to :)