Not bad, but...
To make a great puzzle game, in my opinion, you need to make it challenging, yet offer multiple ways to go about it, as well as a sense of randomness that keeps the game fresh beyond the first playthrough. I really want to say that I like this game, because the concept itself is great and original, something not always easy to come by...however, each level does have that scripted feel. Also, the computer's auto matching is just out of place and hard to abide by. On top of that, as they're all saying, you must be able to use the hammer before it clears the board and costs me 100 seconds... and on the flip side, in this game you can tell way ahead of time that you will not be able to make any more combinations the way your board is set up, so a button that refills the stage with a 100 second penalty would fix both of these problems.
Overall, the idea is great, but needs tuning. Get rid of the frustration, add in a little flexibility, and it should turn out to be a great puzzle game.