Nu VS mun

Not Unity, but Nu is an F#-first game engine you might look into.

Take a look at Nu. I haven't used it, but it seemed pretty heavily inspired by Elm when I was reading about it.

Mun is a statically typed language that compiles to machine code with LLVM, designed to be hot-reloadable: https://mun-lang.org/.

Perhaps https://mun-lang.org? Might be a bit raw for your needs tho.

But that’s not all! In total, this release contains 111 pull requests made by 5 of our community contributors and our two Core Team members & Dependabot. Thanks for having our back! For a full list have a look at the changelog, but the main improvements are:

Whenever I read about Mun, I'm always really, really intrigued… Until I remember that it currently has no string type and support for one is not currently planned. That's a bit of a shame, IMHO, because otherwise, this looks great!

There's mun [1] which is statically typed and AOT compiled.

1: https://github.com/mun-lang/mun

From the reverse-dependencies of the salsa crate, the (archived) Lark compiler used it and the Mun compiler uses it.

I notice that there are projects like mun trying to achieve a similar goal, but I'm kind of curious why they are not getting much attention from the community.

Have you heard of https://mun-lang.org/ ?

It's an embeddable scripting language with the goal of being a Rust-like language that supports hot reloading of functions AND data. To achieve the latter, it uses GC'ed memory such that memory can easily be mapped when the memory's type changes.

It's still in early development but maybe one day will serve your needs :)

In terms of pure Rust engines/frameworks it seems the overall "problem" is lack of scripting, at least from my perspective. Mun seemed extremely interesting, but since even the project itself says "don't use it" I guess it's not a real option, and considering the amount of time we spent on the GDScript/Rust integration I'm a little worried that rolling something more custom would be even less efficient.