i got another game called Armadillo Run....it's a 3d game, with the goal to make the ball like armadillo reach the goal place from the start position with the help of suitable materials. You can control the tension's in strings and materials too....and overall, it's really really interesting.
It's available for iPhone, iPad, PC, Mac, and Linux. It's $10, but it really is entertaining. If you're knowledgable about orbits and how they react, it has a relation to physics. The basic idea behind the game is the laws of motion.
You are controlling this bubble in a closed arena. There are also other little bubbles in the arena. Your objective is to consume all the bubbles. When you consume the bubbles you get larger. You move your bubble by clicking on the screen. Clicking will shoot out a small bubble in the direction you click and you are propelled in the opposite direction. There is also gravity involved, elliptical orbits, and a bunch of other cool stuff.