I agree with the comment below me. Being able to have more pieces in a row would be a great improvement. Other than that, great music and a fairly relaxing game to kill some time on. Well done.
It's a decent enough game, but I don't really like how you can only get rows of 3. A game like this is more challenging when you can try to get more in a row. I'd recommend you fix that, otherwise it's a nicely done game!