For what it’s worth, that same github user already reverse-engineered the game : https://github.com/skynettx/raptor and this one should be able to compile on modern platforms.

There is probably a story behind the source release, I wonder what it is…

Wow, incredible news! So many memories

That’s not as true as it’s been : they’ve published kernel modules as opensource. It’s clearly not perfect nor comparable to what AMD or Intel do/did, but it’s way better than when Linus raised that finger ;)

I’ve had a blast playing Smokin’ Guns : https://www.smokin-guns.org/downloads

(Veloren is pretty awesome too, in a completely different way : https://veloren.net/ )

Not sure if it checks all your boxes, but you could have a look at the following (and tell us if they did) :

• https://heroicgameslauncher.com/
• https://github.com/kra-mo/cartridges