Pros:

Loved the different environment available for playing.
From the dam to forests & into the underground onto the base.
the atmosphere, especially when I got to the forest part.
Outstanding details.

Cons:

Lighting is too dark for me, or at least there should be more well lighted scenes. I'd give a 100 if there were

Conclusion:

Loved it. I'd recommend others play it, I think you'll enjoy it. Would make a neat movie bit.