You cannot buy the game yet, unfortunately. Release date is unknown, but soon you will be able to pre-order it. It also has Steam achievements.
In my opinion, the game looks beautiful. Space games are always cool (I am a huge Chicken Invaders fan – but I hate the first 2 games) and I played Starcraft II (soon I will start HoTS) – also Kerbal Space Program, but I got bored of it since I got to Mun, Minmus, Eve and Duna already… maybe in the far future I will re-install it.
Minimum system requirements:
OS: Windows Vista SP2 / 7/8
Processor: Core 2 Duo Processor or Equivalent
Memory: 2 GB RAM
Graphics: 256 MB DX9
DirectX: Version 9.0c
Hard Drive: 8 GB available space
Sound Card: DirectX 9 Compatible Audio
See you later guys, and sorry for being so late – I was very tired and I got 2 hours of sleep