Dust: An Elysian Tail

Dean Dodrill has done an amazing thing with Dust. As a game developed almost entirely by a single individual, he has really done a good job of creating a tight combat system, many reasonably well designed levels, and a compelling story with decent humor sprinkled in. On top of all that good design, the artwork is beautiful, and the voice acting is high quality. If you're looking for a high quality side scrolling action game, I highly recommend Dust: An Elysian Tail. It's available on Steam and maybe xbox.