Not familiar with Vast Grimm but you know how to make content for M脰RK BORG?
Vast Grimm was built using the MB system, so you can create all sorts of great stuff for this horrific sci-fi setting just as easily! Calamities involving space w眉rms have every galaxy, planet, and moon going post-apocalyptic (or near it) because of infectious alien w眉rms. THEY turn their hosts into the hive-minded Grimm who are working to consume the universe. It should have the same dark, horror vibes as M脰RK BORG but in space with neon pinks, blues and punk-rock overtones. And with a lot more grotesque slime!
Vast Grimm was recently crowd-funded on Gamefound for printed copies of the book (not yet available). The digital PDF of the game is already out.