I'd consider it more of a ship management sim than a space combat sim. There is no dog fighting as such but you have to keep on top of a lot of systems. Crew members rush around to put out fires or repel hostile boarding parties, etc... It's also very unforgiving. No going back a few saves. Dead is DEAD.
How much "saving" is involved in saving the galaxy? I'm all for scifi sims, but I like more mellow and mercenary premises.
Well the premise is that you are carrying information vital to the "federation" and are being chased by "the rebels". You are followed by an ever advancing rebel fleet so you are forced to constantly move forward. You have to get through 8 "sectors" to get to the end boss (I have yet to do that on Normal mode). Even with the ever advancing rebel fleet after you, I never felt pressed or under the gun time-wise.
Plot wise that's about it.
You can run your ship however you see fit, deal with pirates, slavers civilians or w/e however you see fit.
Watch the review, it gives a good idea what gameplay is like.
The game is fairly simple, but its well worth the price tag.
I wish it had a little more of a plot/story mode. Its more of a rougelike in that regard, where you have 1 life and 1 playthrough and everything is randomly generated.