To me, they don't have the feeling of Star Wars. I get the feeling of some emotional moment from like Final Fantasy. Also, they would need to be extended in length, because Star Wars music is always pretty long, from 4 to 6 minutes, with some exclusions.

Because why you are playing the game you want a sense of danger and urgency. Like fighters are on your tail and you are flying around a cruiser for cover while screaming for back-up kind of music. Plus the need for making them longer is because games need to have soundtracks that don't change songs every 2 minutes, making the mood feel rushed.

I don't know, going with the already made and professionally done Star Wars music would have my vote. Don't mean to sound harsh, I like making music too, but unless I have an orchestra and a choire I am not going to top John Williams.

I'll put new music over the SW music any day, simply because it's new. Nothing wrong with William's tunes, but I've heard them so many times before it's scary.