It works quite well in A Clockwork Orange.- characters speaking weird made-up dialects - i get that people in the future space empire might have different languages and dialects, but dont try to make them up and inflict them on the reader
I once saw a Vince Diesel SF action movie that had been dubbed into a language I didn't recognize at all. It made it a lot more exotic and alien, very effective. It really seemed like something from another planet.
It turned out to be Thai, but not the polite Thai that foreigners are exposed to.