Glass from alien to human base can be shot through by turrets but not passed through by aliens.
Some fog problems at spots. I trust they will be worked out.
The sparkles in the popcorn machine are a bit square.
The stair supports don't really support the frame of the stairs.
I wouldn't rate it as playable just yet. Gameplay-wise I can't say much but it seems to me that both aliens and humans are at a disadvantage, which to be honest if pretty hard to do :p, if you can tidy the look up, put in a bit more lightsources in the darker spots, work on defining the rocky sediment of the streams you can see through the glass, work on detailing, work on making the feel complete this map can work very well. One thing I would directly advice you about though is widening some hallways a bit. I can see this really becoming a problem.