I tried that over a month

except '- the directness and simplicity of JavaScript'

https://github.com/artpar/guage

But somehow the language feels so foreign. it can obviously do hello world, but I don't have a real use case

PS: the "Pure symbols only" is no longer true, most symbols have been converted to English names

and, the "days" you see there in the markdowns are "claude code sessions", not actual days

All of those things have been built before, you're even referencing existing languages that have those "features". Parent seemingly was asking for people to build something completely novel, that doesn't have any FOSS code available that done that thing before.

And yes, LLMs/agents can help you do it for sure, I'm currently building the lisp of my dreams in my freetime, and already have compiler, interpreter, UI framework and some other things already done in a way I'm happy with.

You have conflicting requirements there - expressive type systems are not direct and simple. And elegant is subjective.

But seriously though: have you tried to see how far you can get with the design right now? You can start iterating on it already, even if the implementation will lag.

Nim comes close to what you want.

Looking a bit further out, F# and Swift also come close.