Alright. I finally got some time to listen to the whole thing.
Simply but, I think it's quite amazing. The style seems very similar to some scores for older movies, especially mystery and horror themed.
Most of the composition is good, even though it may be a bit simple at points. I would've probably given this a 4.5 by itself, but with this lenght and consistensy, it easily deserves a 5.
Needless to say, this is better background music than it is standalone music though!
Either way, brilliant job ;)