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Furby's right. The scoring is messed up and the game rewards just speed-clicking around carelessly. There's really no need for the powerups since it never (in the amount of time that I played it) became difficult whatsoever.
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Scoring system completely messed up. As far as I can tell it gives one point per removed block and one point per click (no matter if the click removes anything or not). This means that there is no reason to try to clear big groups and just speedclicking like crazy is the way to get the most points. If removing 5 blocks instead gave 25 points (5x5) and there was a combo bonus for repeatedly not removing groups of 2 then this game would be a whole lot of more fun.
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I enjoy your game. One thing you might want to consider is a penalty for mis-clicking blocks, otherwise players can just spam clicks to get points. Also, the sound comes though a little distorted, but that could just be my machine (someone else verify?). Keep up the good work. :)