Pinky

https://pinky-lang.org/
https://github.com/KevinBatdorf/pinky-wasm

Pinky is an extremely simple scripting language that is mostly used by beginners when writing their first compiler implementation.

Pinky is the perfect toy language for those who are just starting their journey into learning about compilers & interpreters. The language is ridiculously small, allowing students to really focus on compiler concepts instead of hipster language features.

Think of a procedural language with a tiny Lua-like syntax.

I heard about it via this toot showing a screenshot of their very cool interactive language playground:

https://pinky.cool.omg.lol/