Here's a good game for fans of quirky physics puzzlers like Color Infection and Splitter. Civiballs asks you to drop colored orbs into the corresponding urns. Most orbs begin the level suspended in the air by chains and ropes. Your only method of interaction is to cut those cords, and let physics handle the rest.
Just point at a chain and click to sever it. The puzzle is in which chains to cut first, and in getting the timing right. Think through a puzzle thoroughly beforehand, and you may be able to complete it flawlessly on the first try; but between all of the cannons, catapults, ramps, chain reactions, and trying to slice a swinging cord at just the right moment to propel a ball at full speed across the screen, a lot can go wrong in the execution. A single click can have huge consequences.
Civiballs is a gameplay clone of Obulis, an inventive and beautiful commercial game by IonFx. In fact, it hews so closely to the ideas from Obulis without adding anything significant that I'm tempted to call it a rip-off. However, Civiballs allows us to play in this territory for free, and it's quite well-implemented, even if the spherical title characters have a confusing tendency to wear spectacles. Why did they have to be anthropomorphic, exactly? I'd be perfectly happy to chuck them around without having them wink and leer at me like a gang of flirtatious jawbreakers.