If I have to put a label to it , I prefer Space Fantasy .As a huge fan of the original Marvel Comic , I love the tagline , " The Greatest Space Fantasy Of All !"
Yes, nice and straight forward.
And i emphasizes space as a setting instead of lingering on science (even if tech is still present in SW).
This section from the Wikipedia page for Science Fantasy (closest “official” equivalent) summarizes the recent discussion pretty succinctly I think;
“Distinguishing between science fiction and fantasy, Rod Serling claimed that the former was “the improbable made possible” while the latter was “the impossible made probable”. As a combination of the two, science fantasy gives a scientific veneer of realism to things that simply could not happen in the real world under any circumstances. Where science fiction does not permit the existence of fantasy or supernatural elements, science fantasy explicitly relies upon them.”
Also interesting how it specifically mentions that the old pulps appealed to the “New Wave” writers of the 1960s (which I would say Lucas qualifies as), who were “exasperated by the limitations of ‘hard’ SF”. Seems pretty close to what I wrote in my essay, though I focused more on the German Expressionist influences (which I’m sure film students of that time would have been very much aware of).