I liked the game. Simple concept. Smooth presentation. If you're going to continue on this game I have a few suggestions: 1. instead of holding shift down maybe use a toggle button like spacebar for shrink/grow. 2. instead of clicking every time you want an object to shrink/grow you should just be able to hold down the mouse. 3. more complex puzzles. it took me no time at all to figure out the puzzle.
Is it the idea for bonus level?