This is a really great proof of concept. The simple system of following footprints whilst trying to keep track of your own is inspired (hilariously, bunnyhopping helps). The use of sound in particular is outstanding. The general atmosphere with the low visibility, breath fogging in front of you, and the little details in the text descriptions has been successfully nailed.
Obviously, because it's just an experimental project, there are some rushed aspects (I found the pack of deer who run away chilling at the invisible wall - though it was nice to hang out) and if this was to be expanded upon further then there definitely needs to be a checkpoint system, map, compass, and page for custom notes. But you know you’ve come across something special when you're reaching for a pen and paper...