Nim has a soft real-time GC designed for game development. https://nim-lang.org/docs/gc.html

I'd also be curious why the OP decided not to use Rust.

I tried, and really liked Nim, and I believe the custom GC settings would allow for game dev for the types of games I try and make, however, I am biased against the sort of Python syntax and prefer Lisps or standard C-style syntax. This is totally subjective. I can't speak to Go or Crystal, although Go looks like C to me!