When Epic Games, makers of Gears of War, decided to announce a download-only Xbox Live Arcade game as a headline title at this year's E3, we sat up and paid attention. A tribute to Metroid, Contra and 2D games of the past, Shadow Complex would be worth a full-priced disc release--thankfully, it's a much more affordable XBLA download instead.
(Platform: Xbox 360/Xbox Live Arcade)