[Scramblejams]

Check out Jai, apparently if you ask nicely its author will let you use it. Unofficial docs here: https://pixeldroid.com/jailang/

[Razengan]

Jai is just a C-like with manual memory management etc.

I mean something that is divorced from hardware and just focuses on gameplay logic; let the engine continue to be in C++/Rust/whatever.