@WhatAmIDoing So ... basically Warhammer 40,000 AKA a massive grimdark fantasy world spanning the entire Milky Way galaxy and perhaps the most widely known sci-fantasy to exist in a documented form? Yeah I'd say the genre has some following.
Nobody get to excited. There are many different styles of space faring fantasy. It could be Warhammer or it could be flying galleons that move from world to world a la Peter Pan or the "Enlightenment" episode of Doctor Who with Peter Davison.
Let's see what our initial poster has for his or her vision