What I loved:
-Design of the marines is great. They look like soldiers, not too bulky, not too lightweight and they feel relatable.
-Customization. Being able to choose whether to fire tracers or non-tracers, single shot, burst or full auto, grenade sticking, exploding on impact or bouncing, turning your flashlight on and off and of course, lifting up your helmet adds a great layer of depth.
-Open and believable world. The station looks really realistic. I love the idea of choosing to go wherever I like to complete my objective as well.
-Presentation. The animations looks incredibly sexy, the way you reload is awesome, as well as all the visual effects when you get hit, when you get tired, how you sway from side to side when you run. Plus, the graphics themselves, while a little bit unpolished, were awesome. I also loved that vista shot of Earth when you got next to a window. :)
-Shark creatures are just incredible. There are incredibly well implemented and with claustrophobic hallways combined with the shark's lethal attack (and sexy animation), you have a very nerve racking combination.
-RTVP is truely the next step in immersion. Nuff said...hearing Kristian and Kim's voices echoing and even alerting shark creatures was almost too good to be true. Blew my mind completely and utterly.
-The sound in general, of the weapons, to the sound of the environment itself, the shark creatures, was all top notch.
What I thought could be improved:
-Better animations, especially for when resuing a teammate from a shark creature.
-Less clipping through objects and enemies.
However, I'm sure you've considered both of these. Besides those two, I can't think of much else to complain about without actually playing the game.