I haven't given it a terrible amount of thought myself, as I find genre to be a dangerously fluid concept to begin with. But I think the basic idea is that it's closer to a fantasy, yes, because of the magical/spiritual component which is so heavy, and it's a very archetypical Campbell's "Hero's Journey" story, like many classic myths and legends. I can almost get behind this, as the sci-fi elements are almost periphery to the story, mainly a cosmic setting and some nifty technology. Though the droids and artificial intelligence play a big part in it, so I can only give that argument so much value too. But yeah, a lot of it doesn't really mesh with traditionally science fiction themes and motifs, more in line with "fantasy" as a story. I've also seen it frequently described as a Western, which is slightly less strong a case, but certainly has its fair points. I guess I'd call it simply a "space opera" myself. It's actually a fairly brilliant piece of filmmaking in terms of colliding different genres and classic narrative identities, but I wouldn't want to pin it down to any one thing personally.