I've got some more suggestion based on the few hours I've spent on the demo.
Since the whole game is based on a single ship, I think it will be a whole lot more interesting if there is more "depth" in the game so people actually gets more attached to their ships. The best thing I can think of are some speech effects. The ship crew is amazingly silent right now and that's not really exciting. Two things that quickly come to mind are when a weapon group is ready to fire the weps guy can shout "Weapon group one ready!" or something like that; the other thing is when the ship takes damage, or get hit by one of those dreaded toxin injectors, some screaming over the intercom will really add to the experience.