Effing Worms.
Effing Worms lets you play as a massive worm that's currently underground, and is hunger for flesh. There's only one goal in this game, and that's to eat as much human/animal flesh as you can by jumping out from the ground - that is, before you get destroyed by their military effort to stop you from eating them. It's a war for the humans, but it's just meal time for a giant worm like you.