Very good topic. I have not finished listen, but there are already some very good things. May be too predictable or conventional. It takes something more contemporary and with a cinematic approach in my opinion. Something between Alien and Prometheus, while trying something new.
I had already said, but I loved the soundtrack of Prometheus. Streitenfeld did a very good job, combining organic and mechanical sound. "Weyland" is a great theme, intimidating, strange and even disturbing. Mention to "Invitation", "Planet", "Earth" and "Space Jockey" ...
But the best is the two themes made by Harry Gregson-Williams. It was in perfect harmony with the images of the film. Wonderful, deep, human, mysterious, powerful ...
HGW is perfect choice for this.