Great Game
I've been sitting here for 4 hours trying to beat a random Expert map.
This game is exceptional. To address some of the comments I've seen other people posting:
-It's perfectly possible for your inventory at the top to go into the negatives. That number reflects your net ammo/wood/survivors. If you set your buildings to stock more of whatever supply type than you currently have, it'll go into negatives.
-It's not a real-time strategy game, where you move your units around. If you try to force them to bring your supplies along with you you'll quickly confuse the AI and get in trouble. The idea is that you create a line or web of linked supply depots, each with at least 1 survivor. That way whenever you need resources they can be passed along the chain to where they need to go.
The one bug I ran into was that at one point I think I accidentally right-clicked, and all of a sudden I could only change the values in increments of 5, which was one of the weirdest bugs I've ever seen.