Really nice Physics Puzzle game! With a nice User Interface it can be a seller.

tree marks:
-the player has to press the left mousebutton and use the wheel
at the same time for rotation. That too complicated and bad to handle.
Try to let the object rotate directly when the player
hovers over it and uses the wheel, or let it get constantly selected with the right Mousebutton.

-let the user skip the tutorial, or make a special seperate tutorial level.

-dont use such an unzip extractor.

Either use a classic installer, or just a zip
(use a zip archive, not rar or 7zip, lots of casual users cant extract them, and they dont save much more space
than a normal zip.)

Really nice entry I have to say.
Spend some additional time (or help from an Artist) to pimp
up the panel grafix. Then its a really good casual game.

You might also think about implementing an Editor for new levels.
So Users can set up levels, save them (in a textfile or so)
and upload them to your server.