That was a wild ride of a game, good lord (that's a good thing).
Solid d6 dice pool game, I like the roll tables, though your core game loop has a REALLY harsh death spiral. As in, chance of success goes: 4d6=51%, 3d6=42%, 2d6=30%, 1d6=16%
The player will die within something like 10 rolls. I know it's supposed to be punishing, but it's also essentially impossible. (Which is kind of cool in it's own right). Consider emphasizing that the game is a meat grinder or adding some kind of lateral character development to give things direction.
I love the vibe, and giving the character a very specific win con is also nice for a short game. I really love the roll tables, though I might add one for the south tower, or otherwise expedite it's lore. It's not super important to the hero's journey, whereas the intro contained both the world and the game premise.
This would be one hell of solo journaling game, so maybe lean into the inevitability of the hero's death and more guidance on what actions prompt a roll.
I hope that didn't sound too critical, because this is a very very solid game, and I'll try it next time I have an afternoon. Nice work. :)