I added a bunch of iPod games to the site a while ago. I only added the games found on Apple.com here: http://www.apple.com/games/ipod/ (Note that they put a subtitle after the colon of every game title that is not part of the actual name. You can see the same list without the subtitle on any game page such as this one on the bottom right)
I'm not sure but I believe this is the entire list. I think it would be safe to remove any game not on that list because it's probably all of them.