YES, I am thrilled to see that someone else went the fae route on this prompt!!
Favourite details: Building something from home that reminds them of their humanity is a really nice touch (and also a great way to make the story move back and forth dynamically!). I also love the max level fae mutation details, which tow the line perfectly between playful and unsettling. There's great use of public domain art here, too -- that hex flower is gorgeous. Speaking of which, the GM hiding the exit in advance feels like a fantastic way to randomize the flow of the game.
Would be nice to have: The two skin colour mutations from the increasing fae number step on each other's feet a bit, should someone end up with both -- would love to see another mid-level option for these troubled backpackers.
Some fairy thoughts: Reflecting on my own experience, I really like how we both took the same general idea -- humans getting into increasingly deep trouble, countdown ticking down, on fae borders -- and went very different directions with it. The fae mutations and transformation narrative are great, the fact that they're accidentally lost backpackers is really evocative, the gear informs direction and action, and the map approach seems super cool... and these are all elements completely and wholly absent from my piece.
Anyway -- super cool, really glad to see this here. (: