The Republic of Heaven

Birthday sale! Lasts until 15th January.

http://www.crayonphysics.com/

Pretty cool little game. I have it on iPhone.

Edit: Paypal have a charge which I think is around 50c so pay at least that much.

I bought it for a generous $3.00! I played the demo a while ago so I'm looking forward to this when I have the time.