What music do you expect from a 4X game? As regards historical 4X games, I predict a mixture of triumphal philharmonics and noodly period skits, as though wandering between the main floor and the giftshop in some museum of empire. If it's a fantasy game, I think of choirs blaring wordlessly or singing doggerel Latin or Welsh. If it's a sci-fi game, I think of choirs and synth.
I haven't heard any choirs so far in Hard Void, though I may have encountered some synth. As regards the trailer and demo, it deals exclusively in heart-battering techno. It sounds like 3am in a club I wouldn't have been old enough to get into, when this kind of stuff was in vogue. I can picture the bouncer glaring at me. Gosh, the bouncer sure has funny-shaped pupils. Mates, I fear the bouncer may be Lovecraftian.