Ok, the game is ready and uploaded, you can see it at http://www.ludumdare.com/compo/ludum-dare-24/?uid=11694
In the end I decided to not include a score — I hate games that have scores, and it’s not a kind of game you play through more than once anyways.

You left your food in the fridges for too long, and it managed to evolve into hostile life forms. You must de-evolve them with your de-evolution gun before they escape and take over the world.