For the XBLIG release the graphics have been improved, music and sfx added, atlantean AI upgraded, and the whole game is now much slicker. The tutorial has undergone a massive overhaul, and there are now 16 levels.
These screenshots are dated May 21st, 2010.
These screenshots are from the original competition version, and are dated April 25th, 2010. You can directly compare the visual differences as the newer Xbox pictures are the same locations as the older PC pictures.