I didn't really know anything about this "game" (read "interactive movie" if you like) and to be honest, it didn't actually blow my mind but it didn't leave me that cold either.
Playing the game is very simple: you watch couple of few minutes long movie sequences and after that you answer some questions considering what you just saw. There are no right or wrong answers, just your own opinions and the game suggests that your answers are your real thoughts about the issues. Questions are often related to sex or sexuality, so in my opinion the game is best played alone.
Your answers has the influence to the movie's plot: I myself played (watched) the movie two times from beginning to the end and saw two very different ending. Movie's plot is strangely interesting, although I'm not usually a big fan of drama. But some good actors (including John Hurt) and interesting & awkward questions sucked me in from the very beginning.
Between movie clips, you can move around the house and get more information about the characters. This isn't necessary and you can jump to the next video clip when you're ready. The are some patients´ case files, recorded messages, diary notes etc. Not very interesting if you ask me, but read/listened most of them through anyway,
This kind of interactive movie "game" suits perfectly for devices like iPad. Following the story with iPad is much more entertaining than sitting and staring computer screen. These kind of "games" are definitely not for everyone but I enjoyed it and don't regret getting it. Price was a bit high for an iPad App (8,99€ when i bought it). Still eagerly waiting for "Point of View" to be released on iOS along with The 11th Hour and of course the very long waited The 7th Guest: 3 (yes, I am a fan) ;)