If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
The planet is being attacked by an intergalactic blob, but you can save it! Tap or click to aim at the Bubble Bombs. Assemble three or more of the same color bombs to destroy them. Reach higher levels by destroying more and more bombs. You must work fast because the alien ship is getting closer and closer all the time!