Kerbal Space Program, as addicting as Minecraft? Not quite. It is really fun however, and you have to love the little green spacemen in it. I liked them so much that I even made a skin of them! Eyes are little too big, but i couldn't get the pupil in the center otherwise... Oh well, hope you enjoy!

PS:right now Kerbal Space Program is in alpha phase, and is free to download! Check it outat http://kerbalspaceprogram.com/index.php