Really interesting mix of 3D and top-down. Loved the ambiance, very spooky. The controls are intuitive and the lack of backwards motion made for a more unique gameplay experience.
That being said, it's pretty easy to get lost in the world. I would have liked to see some kind of map - maybe some kind of sensors or fog-of-war system to keep from spoiling the player, or simply more navigational aids.
I did like the enemies - they could be really tricky to see sometimes, which made the experience all the more spooky.