Hi, author here! Thanks for the feedback. I'm not in charge of Try It Online, so I can't do anything about filling it with code by default, but as someone else noted, there is a Hello World button, which fills in a (very trivial) snippet.

There also a bunch of examples with tutorial-like explanation in the Examples folder.

I'll think about adding one example to the main README though, just to really put people off of looking further into the language. ;)

While I'm here, in case anyone does actually use the language and find it to be useful, I also wrote a VS Code extension that lets you use it as a powerful search-and-replace alternative: https://github.com/m-ender/vscode-retinate