Here’s a natty little flash game I’ve been playing by the name of Gimme Friction Baby.
You fire the balls and once they come to rest they expand to fill the space around them. Then you use subsequent balls to try and hit the previous balls three times – at wich point they break apart and vacate the space they occupied. What makes it difficult is aiming the gun – it constantly sweeps back and forth by itself, so it’s easy to misjudge the most trivial of shots.
Still, it’s fun in a mininmalist kind of way, and the ambient music is cool, too. 🙂