I really like the way you guys developed the atmosphere, using both sounds and graphics extensively with dark hallways along with creepy ambience. Makes for even better encounters!
The only thing I'd note is that the sound of the feet doesn't drop-off based on distance! You can't tell how far or near the thing is based on the audio, only where it might be coming from. Other than that, it's a pretty neat game with a mechanic I haven't seen utilized that way very much!