Doom Deat & Destruction Tycoon (Ludum Dare 33)

People are living peacefully in a fantasy world because the heroes have successfully conquered the whole continent. You take the role of a villain monster spirit that has to cause doom, destruction and death. Gain power by causing chaos and create more powerful threats to take over the world!

And now what is actually happening:

Villagers walk out of the village to gather resources. You can create Monsters (very aggressive Bunnies) and place them on the resource fields to attack villagers trying to gather there. When villagers gather enough food they'll reproduce. More villagers mean more victims! Kill all villagers to finish the game.