Nice game.
I have only played on the easy version but I assume that the harder ones will be... harder
Just a few recommendations:
Rename the "Help Me" file to somthing more like "How to play" or "Read Me"
Make the game's icon in more resolutions so that it looks better in the dock.
and make more games, because your style is good and you can put your ideas down well.
Most of the problems are just nitpicking though so good job
Mist