Really really cool! Love the pixelated look and the snow falling is simple but gorgeous! I did encounter a bug where I died as soon as I respawned a few times, but eventually it worked itself out so it wasn't really an issue. It was quite rewarding to be able to look down and see the progress that was made. The part after the checkpoint in the cave (which I loved btw) was a bit difficult to plan with low visibility which made for a difficult challenge :) I really enjoyed the methodical approach I needed to take to figure out a way up.
I think the one thing I would add as a quality of life thing might be an indicator that tells you what pick(s) you have available, cause sometimes in the heat of the moment (or should I say Frost of the moment) I found myself forgetting which one I just placed and I would be sent tumbling down the icy chasm I just worked so hard to climb.
All in all, I loved this great work!
And P.S. Im on a laptop with a trackpad instead of a mouse so it was an insane challenge, but definitely a fun one :D