CARRiON

Oh, and a quick google search led me to this: http://www.mobygames.com/game-group/games-with-dopefish

Adding to the list: Rocketbirds: Hardboiled Chicken, Alan Wake, Defenders of Law: The Rosendale File, Voxelstein 3D, TAGAP: The Apocalyptic Game About Penguins, SiN Episodes: Emergence, Red Faction, Jazz Jackrabbit 2 and The Red Odyssey.

30. Plus two fan games about him.

Oh, add RAGE. And Doom 4, can't believe I forgot Doom 4.

Someone add Supertux and Retux to that list for me.