Finally getting around to this one. I think I'm about five minutes of playtime away from finishing. A brilliant and potentially productive idea done mostly right, this has a great narrative development near the end of the game that opens up its world, forces a reconsideration of what's going on, and raises the possibility of much more to come. (And that clearly ties it in with the Half-Life universe.) This has been a fun game, and I am looking forward to the coming sequel.