This game fits the rule really well!
My biggest gripe with it is with the goal of the game, it seems a bit odd to me. The point now is to kill all the players, which seems obvious at first thought. But the whole point is that your playing as the dungeon master, and the goal of a dungeon master is to make the game fun. So a system where you need to get the heroes through the level with a challenge seems like a better idea to me.
Just a lose idea: maybe the player has a select group of enemies it needs to place down, but not with the intent of killing the players but making it so they can defeat them all and reach the exit?
But still neat little game!