Nim is really incredible. The only things I cannot get over is the fact that it goes the inheritance route in a way I find to be hacky and fragile (no more than one level, really?) and traits are not a core feature. If Nim's primary approach was composition + Rust-style traits (that work at compiletime and runtime), I'd have a hard time wanting to use anything else.

yeah, Nim is great for that... much easier to explain to others than C or Zig especially for math code

Yeah, for a language that claims to be a better modern alternative to C, zig verbose syntax is really an eyesore to look at compared the very same codebase written in C...

I lost immediately any interest on it

How about Odin?