Hey Stardockers,

I'm the dev for an indie space game called "Salvation Prophecy".  One of the players suggested I drop a post in here, since there's lots of space-sim and sci-fi fans around.

Salvation Prophecy has big space ship battles, planet battles, alien worlds to explore, and some military strategy at the highest rank of the game. 

It's PC, indie, DRM-free, single-player, released on Desura and Gamersgate, and closing in on Steam greenlight.  A quick overview:

4 playable character races

Screenshot:  Docking at a Space Station

Screenshot:  Invading an enemy planetary colony.

Screenshot:  An alien artifact site.

Screenshot:  Galaxy map and military strategy interface.

More features and info here:

Steam Greenlight page

webpage

Let me know if you have any questions, I'd be happy to answer.