boul:karé comes from Studio Laganne.  The object is to get the blue circle and blue square to gobble up the diamonds.
 Tap once to activate the blue circle and swipe in any direction.  Tap again to activate the blue square. There are 55 levels. They're not too hard.  And they go pretty fast.
https://itunes.apple.com/us/app/boul-kar%C3%A9/id1449012681"mt=8

...