Play as a machine gunner defending your beach from an enemy invasion. Survive 10 waves and win the game. Each wave gets harder and harder. Don't allow more than 10 enemy soldiers make it to your defensive wall.
Defend your base! Use your magnetic ship to pick up chunks of junk and drop them on advancing enemies. Absorb junk into your ship and base to upgrade them and assure your victory.
Build towers and survive through 51 hardcore waves of aliens that heal themselves, haste other enemies, split into more enemies and freeze your towers.