I strongly approve of this. Code snippets are nice, but with new languages⁰ it's rare to have an example of a self-contained but and complete application to get a holistic view. I think a raytracer (or its equivalent) should be a standard example.

0: Or is Rhombus a dialect? Or alternative writing system for an existing language? Or just an elaborate system of shrubs?

Yes, I used as experiment for C++20 modules, C# SIMD instructions and Rust.