I don't play it anymore because I'm more interested in building games and game building now (with Luanti [2]), but it is IMO one of the top FOSS titles.
Oolite does look like Mac, done in COCO? Even Mac/Coco looks dated. Not the screens, they actual look is great.
A Rust version would be cool.
When it's part of a request, it generally means "I don't know tech XYZ but I'm pretty sure I could enjoy it and contribute if it was using a tech I know". Which is generally a form of procrastination.
I dislike Javascript and I don't know Objective-C, and it didn't prevent me to tinker with Oolite, which uses both, because I like the game (now, tbh assembly is "hardcore" so OP's request is legitimate).
[1] https://www.joelonsoftware.com/2000/04/06/things-you-should-...
It seems plausible that AIs could port this code to other architecures. It seems like a good large scale task that most systems probably can't manage right now, but perhaps soon.