This was a fun concept, but even for the fox it was a bit too hard!!
I think it might be winnable with A-5 from the deck. That also helps with a missing rule about whether or not a 6 "beats" a 6. So I played it once with 24 cards and once with 20. I also think it would be cool if the caved in area cards could be spells. For example each time you beat a card you get to keep it. 2-4 could allow you to ignore the dice roll and move that many steps and 5 could be a seer card.
Anyway. I really love the flavour of all the games in this series. I definitely had a very satisfied fox watching me play this one.