FREE iPhone/iPad App: Tiny Defense @ itunes

Currently has a 5-star rating with over 12,000+ reviews. The game is free until Aug 7.

Green Planet is a beautiful home of the little mechanical life forms known as "Minirobots". While living peacefully, their planet was invaded by an army of robot troops calling themselves "The Machines". These machines tried to turn Green Planet into a space resort and had captured many of the Minirobots, but now they are fighting back!