Phew... Cleared 2 and a half (maybe almost 3) of the upmost rows... after over two hours of playing. Pity I don't have time to clear all bubbles :P A "save" option would be nice ;)
However, it really gets boring fast. And it's too easy to get the final upgrade as well as maintain it. Would be good to add some kind of progress report - score, or the number of the cleared bubbles or sth similar. I know I can refresh the High Scores list, but it's not the same ;)
The badge is also very easy to gain.
But all in all, I liked this game. It's nice and simple. Although waaaay too big :P (in the meaning of the amount of fields)