I have no idea how I beat this before, this game is ridiculously hard. I'm not sure I understand how you can destroy everything and get a x2 multiplier or a x1 multiplier - seems like you're supposed to cause a big ruckus all at once but then keep minor explosions going on afterward? Weird mechanic.
The game is pretty and the sound is well-done but it lags pretty badly as the game progresses, making me think you might be keeping data allocated for things that have spawned.