Retroburn Game Studios is a small games company making games primarily for Xbox Live, but also the desktop. Due to the portability of XNA they are now spreading out to Microsoftâ€™s newest platform, Windows Phone 7.
Shifter is a simple picture puzzle game we are all familiar with from our childhood. The above video is an early demo, but of course the game does not get much more complicated than this.
Read more about their efforts and other games at their webpage here.