That looks interesting. I am not a huge fan of the tarot card bit, but I would love to find a dungeon game that was more about the crawl than the combat.
You can play as the GM with a d20 and give the players a standard playing card deck. The "cards as randomizers" does allow for some fun stuff with Tests and the like.
HMTW and TB2 kinda come at a similar idea from different angles. Heavy on procedure and phases, but HMTW is a pretty lighthearted game in relative comparison about the bonds between a group of losers venturing into the depths and is great for large to mega dungeons; while my understanding of TB2 is that it keeps the heavy emphasis on personal beliefs and goals that BW has, moved into the milieu of harsh dungeon crawling on a smaller scale.