Color Wheels - Simple puzzle game

I made this puzzle game, it turned out to be a bit easier to complete than I had hoped, but then not all games have to be hard I guess. What’s everyone think, anything that needs to be changed?
I’m thinking about making a seperate game that uses gears instead of wheels, so when you turn one piece the rest of the board turns as well.

here’s the link:
http://www.moojoogames.com/dev/colorWheels.php

screenshot:

http://www.moojoogames.com/games/cwScreenShot.png