It is not really an Alien prequel, which is good and bad. I am glad to know more about the space jockey, but I was left with more questions about the Alien franchise. It is an interesting story, so I would recommend it, but try not to go in assuming it has anything to do with Aliens. It is an interesting theory about the origins of humans on Earth, and I would love to see a sequel that answers some of the questions about the Engineers and Aliens.