Great game.
The map could be unlocked with money instead of randomly. It was frustrating on level 3 to have an idea in mind, some map opens up, then I realize I screwed up. Let the players choose where the map opens up, but at a cost.
It sort of felt more like a puzzle game than a management game, because of the limited space, and pieces that should be used in a certain way around one another.
Having to manage the health on everything was a great element of the game.
All in all I really enjoyed it. :)