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. Watch out for special powerups to help your cause.
Fly over a piece of junk to pick it up with your magnet.
Click to drop the junk. Click and hold to absorb the junk into your ship.
Upgrade your base by dropping junk directly onto it.