The listing, Station 21 - Space Station Simulator(steam key) has ended.
http://steamcommunity.com/sharedfiles/filedetails/?id=832848071
Station 21 is a space builder, survival adventure game where you start with the bare bones of a space station and worth your way up to making a station of immense proportion.
You start with a four way core module from which you can expand by taking on missions to get your station up and running and earning your company money to expand further.
In Station 21 you earn money buy investing in laboratory modules where you can choose which experiments you would like to run and training your crew in order to keep them progressing. The more advanced the experiment becomes the more money you will earn. But there is a catch, you only get paid once the information has either been transmitted from a relay module or been sent down on a shuttle, your choice each having the risk of data loss.
Once you start earning money, you can start building and resupplying your hard working crew with leisure modules, food, drinks and of course new tech to play with.
The building in Station 21 is amazing in scale, you can build your station to have well over 1,000 modules if you wish it, possibilities are endless.