The background noise consists of little grunting and mumbling noises from the little balloon people. Other than that, there’s the sound of wind at your ears and nothing but sky and clouds all around. It’s meant to be cute, I suppose. Again, my mind runs away with this one, and I’m left feeling a bit unnerved. What are they muttering about? Isn’t it strange that I’m alone up here, thousands of feet in the upper atmosphere, with only balloons as my companions? Then I’m meant to pop them into oblivion anyway. What is the meaning of this? Just as an additional note on things that don't make sense, you also get a squealing pig noise when you lose a level. Uh, but yes, I suppose it’s cute, in a sense. As for the rest of the game’s sound effects, there’s some pretty standard popping sound effects and some big "Yeah!" or a "Great!" announcement when you score a combo. If someone walks by, they might wonder if you’re just playing a cartoon kid’s game.