I read about the game (available in the Xbox Live Marketplace / Arcade) from game informer magazine. I'm a huge fan of the series and thought I'd give the game a try.
I am HOOKED.
Its sort of a mix of rpg, puzzle, quest, mystery. It's not super action packed but its like directing your own episode of the show with numerous different outcomes based on your actions!
The game is setup in episodes each being 400ms points I believe. I think there are 5 episodes out right now.