Playing on Normal gives you a crappy ending. You have to play it on the hardest level for the best ending, which I just may do later.
Alright! It was tough as I had a hunter alien on my heels the whole time, but I was able to reach Nicole, who was attached to the Marker. I defeated her (eventually) and made my escape with Ellie. What a cool game. Final boss and game ending! Great stream!