Eliss, iPhone/iPod Touch - £0.59

Eliss, iPhone/iPod Touch - £0.59 (opens in iTunes)

Very nice almost-puzzler. The goal is to create supernovae by placing a core of the appropriate size and colour inside an appropriate receptacle. Cores can be combined and split to alter their size, and if two cores of the same colour overlap your life starts to drain - complete enough supernovae and you clear the level.

There's a free demo available here (opens in iTunes). The 59p price is a sale price for a limited period.