Check this one out if you like adventure games. It takes the traditional point-and-click adventure and makes it a 3D, free-roam experience. Only downside is that it's pretty short. I'd recommend it for just $0.99. The game looks great too of course.
I really enjoyed playing through this one - the only downside was wandering (seemingly) aimlessly some times and the "combat" really got in the way once toward the end (waaaay too hard! ) which blew the great timing/pace of the story's climax (and lead up to it.)
If you're looking for a more relaxed app with a great (short) story, this app is worth the buck.