I know it's not the point, but having this publicly available in such a usable form - even with this bare minimum UI - is a huge milestone. A big barrier to adoption I hear from many potential users is, "Are there any big users of Rust yet? No? Why would we?" This answers that.

Half jokingly, all you need now is an emscripten target, so it can be run inside a browser, and anyone can try it out without needing to install an app :)