Really cool game and I could even see more being added to make it a longer play time. Super cool concepts and I love the thin line between saving them and hurting them if you pop the people and dog's balloon.
You could expand on the world a little bit if you wanted. Perhaps adding other forms of transportation like you mentioned for people to be saved from. Generally I think the game in this state is complete but you could add more levels if you wanted to make the map bigger or add more obstacles etc.
