Game Instructions:

You play as an ornery dwarf intent on ruining the greenskins' birthday party. Simply move around the dungeon, and ram into enemies to kill them. Killing the purple 'g' designating the birthday goblin ends the game. There's no incentive to killing the other greenskins, and your health will not regenerate.

You can use the numpad keys or keyboard to move. Click the 'Controls' button in-game to learn more.