Cool game, I enjoyed playing it. I have a few points I feel need some work:
� I should be able to just keep the mouse button down between levels. If feels strange that I have to click again to start the next level, and it breaks the flow of the game.
� Dragging the mouse to fast may cause you to jump over a block. It only happened once, but it could be solved by creating a sprite between the last block and the current position of the mouse every time it moves a long distance, and then checking if that sprite is over the correct block before considering it as a fowl
� Maybe improve level generation? I was at level 35+ and a level generated with only 3 blocks...
� Add music! :)