This game is a fun joy, its not a 4x game like you might think,its more like a standard styled rts with a planet based meta map.It has a nice amount of expansion,colony building,ship building,ship configuration with hardly any micromanagement at all.
There is no skirmish mode,you play out a campaign that gets progressively harder,though I have found some later missions to be easier for me than the later ones.This however is mostly based on how you decide to play and how you counter the A.I. attacking. The game does a decent job of throwing varied attack attempts at you from the A.I. but once you learn how to counter an A.I. fleet it becomes a "rush to defend, then attack" type of thing. Main thing about this game is making money while balancing out having enough fuel to have a fleet and colonize planets which will make or break you if you not careful.
Not sure why it got removed from steam, imagine dev/pub issues but the game has hardly any bugs and runs perfectly on Win7 OS. Its been in a few bundles so if you like a lite strategy that is fun to play ,try and snatch a key from someone.
Solid game for casual play or for a good 20hr + end game completion. A sequel was talked about a few years ago on the dev site but no clue if they making one or not.