Hmm. I read the licence.md. Does this mean if I fork the game to try my own patches, I'm forbidden from using the game's artwork in my forked version?
If so, that is a serious impediment, tbf.
If so, that is a serious impediment, tbf.
Unfortunately non-open source artwork is a problem with many games whose sources were released by the original publishers, after they abandoned any commercial plans.
For example I'm a big fan of OpenRA, but its artwork is still non-free.
I think ZeroK is a great game, and BAR probably also, so I didn't mean to distract from the great accomplishments of its FLOSS gameengine authors.