certainly a nifty concept, if simple. more dynamic clues might make this more exciting. for example, the colour changes in a gradient across the playing field, depending on where the object to be found is.
the concept here is great... I like the interface metaphor that you've chosen. it definitely needs to be tweaked, though.
by allowing the mouse button to be held down, I could hold the ball in the upper corners to rack up score. I could also quickly clear out lines of blocks in a few seconds. this is very unbalancing. the suggestions of keeping the paddle jailed in the blue area are good, but I think that it's too easy with the hold.
keep up the good work, and you'll have a neat game on your hands, I think!
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