The Great Paper Adventure (TGPA) is a french Shoot Them Up developped with Microsoft's XNA framework by Valryon, LapinouFou, Aymarick and Ashen. The nameless hero has to go through every level, killing everything that is on his way with many different weapons (Machingun, Flamethrower, things-launcher, etc) The Game has funny papered graphics and awesome chiptune music. It also include a co-op mode on the same screen (so you can play with your girl/boyfriend !)
TGPA has still the same graphist but he has evolved in his drawing style.
That's why game art style is changing too, and here is some example of the actual game graphics.
Hope you'll enjoy it ;)