I know it's not a lot but this is awesome. I love the look of everything and the creepy, ominous feeling is perfect. No music really adds to the atmosphere. I really like where this was going and would love to see more.
And one quick tip for efficiency. For the trees on top of the mountains, the ones that you'll never interact with. You could billboard them or even just render them as a 2d still image. That way you don't have trees popping in and out for render distance. Also you'd have less 3d objects to manage render wise.
Good job on this :)