This isn't really a puzzle game, it's more like a 'something to keep your hands busy' game. The way combos build is so quick, and the effects so huge, that you're basically playing with a new board every ten seconds; unless you spend a minute making each move, you can't really come up with anything like a strategy. It's a problem with all Bejeweled mock-ups.
To the people below me; every time you run out of moves, the board randomly reshuffles, AND YOU LOSE A LIFE. If you run out of lives, you lose. You gain a life every 30,000 points. Maybe you should pay a bit more attention to the interface outside of the play area; your lives are clearly shown, and you see the details if you mouse over it.