Finished playing Avernum 6 on the iPad last night. Beautiful game design and writing. It's not exactly the game I want to make, but I appreciate it as a game designer, and had a blast playing it.
More about Avernum 6 at Spiderweb Software: http://www.spiderwebsoftware.com/
I'm playing through the entire series now and loving it. I'm up to 4 at the moment. Definitely an awesome series.