I had little problem with the combos, sometimes holding key works, sometimes simple touch is enough. But overall its nice and uses the idea well. Congrats for finished-polished game in 2 days ;)
really nice game. I found it difficult at first but then I passed the all the levels and finished the game. You may improve the scoring system, I want to be rewarded more :) and I want a high-score list to compete with others ;)