Visuals are great and the way you managed the sound was impressive. Panning helps to figure the localization of the source of the sound very well. The atmosphere was horrific and well made. It's interesting that apparently the enemies are those humanoid beings instead of the tentacular dude.
I have to say that I got frustrated really soon. I didn't know what to do so I dropped the game. Maybe I may try again later. Try to give enough hints about what you have to do or play with the plot so everyone can keep interested even if the difficulty is high.
Good work, it may be hard to coordinate a big team so you did it great!