@Catalina Tiger: I was stuck on 7 for a long time too, but then all of a sudden started getting mutations. Click on Sell All whenever you see just a plain clover. Repeat until you get one. And then it gets rolling. But I was stuck for over 2 hours last night, even clearing the board. Maybe a bug.
It's a bit of a stretch to call this a "physics" game. Pretty entertaining, but requires quite a bit of fine-tuning (hotkeys, highscore getting reset, weak gravity etc.).