You probably don't know it, but it's basically electronic music for metalheads. Perturbator & Carpenter Brut play at Metal festivals. I can say it's also clear from the public at their concerts.
Originally, it grew from synthwave, but is much darker.
I'd say it's best described as being the sort of OST you'd imagine in a retrofuturistic thriller movie from the 80ies that would be set far in the future.
What are the first titles you think of when you hear #indiegame ? For me it's usually #hollowknight, #celeste and #supermeatboy Not an analysis, just first things that came into my mind.