It's a shame that the images should be so low-quality. Besides, it's just another simple jigsaw that time will forget. Give it something special like an animated jigsaw with animated pieces.
This application has a principle design flaw in that it it is layered and that the last person to join gets the top layer, effectively hijacking the game.
Wonderful game, but unsuitable for the world outside USA. Please make more currencies available. Google has many links to imagery. Euro notes would be an extra addition as they are colour coded.
Really like the graphics, but it severely needs to be rebalanced. With a single cannon with max damage and rate you can get to level 48. The level 70 boss needs only 5 such cannons to overcome. Each wave is 90 seconds, and after nearly two hours with no speedup or next wave button and not needing to use other weapons I was relieved that the game suggested it was defeated.