Maybe some Wild Orchid Children? This is more on the trippy/'spacey' vibe instead of themes but hey... Expand your musical horizons every once in awhile man lol
With bands like Origin and Cryptopsy, I think the aliens will stay plenty far away. If they are smart enough to get here, they are smart enough to realize that we kill and breed, and that's about it. And we probably cant breed with them, so...I don't know about you but if I ever found myself piloting a space craft in a high speed interstellar dogfight delicately shoving laser beams up alien asses I would want something like that playing in the background.