I like simple clean 8bit-esque sounds you use and you got a nice clean loudness on these.
The minimalism works very nicely, though there was a couple of spots in the first track that some parts felt a little bit too simplistic, really thought it worked very effectively for the other three throughout though.
Definitely captures the mountain feel.
Wasn't expecting the vocal samples on the final track but I liked them and what you did with them.