This is incredible, really!
The first time I saw this game I thought "this is way too complicated for me" but it's actually easy enough to manage once you understand how things work. (And, uh, I also managed to get the city razed on Day 1 the first time I tried...)
The oppressive atmosphere from the graphics and the music really sells the idea of a city on the brink of annihilation.
I'm not sure if it's a good strategy, but I found it was best to send all my soldiers out to secure supplies immediately after a raid. That way they were gaining some resources and no longer using up money. On the final day leading into battle I'd train a new defense force, using the information gathered from spies to make sure I could hold.
The Hand of Fate mechanic is really brilliant, since it prevents the player from min-maxing everything perfectly. This feels very nearly like a complete game as it is. I could definitely, easily keep playing it, but I'm forcing myself to stop at Day 16 since there are other games to review.
Very, very well done!