BTW, the game I'm working on, it all started when I went to look for a modern remake of Virus/Zarch/Lander from decades ago. I didn't really find anything, so figured I'd have a go.
While looking up reference images today, I found a version. Quite different to mine, it's more a faithful recreation for modern computers (though with some changes). Very nicely done.
If anyone's interested, it's a free download here:
https://tapanilanktt.itch.io/z-virus-2022-remaster