Sky Balloon Missions description

Fly a hot air balloon through the sky and collect supplies as you go. Avoid or shoot down explosives tied to balloons using your water hose and other weapons. If you hit a bomb you will lose fuel. Lose all your fuel and your balloon will explode. Each level is three minutes long. After three minutes an airship will arrive to collect your supplies. Once the airship reaches the center of the screen you will transfer your supplies and move on to the next level. Each level gets slightly faster. There are 1000 levels.

Here are the floating items in the game
Good:
Water bucket - Tied to blue balloons; used to refill your hose
Fuel Tank - Tied to green balloons; used to refill your fuel
Supplies - Tied to yellow balloons; collect as many as you can

Bad: (All bad items are tied to red balloons)
Bomb balloon - Causes minor damage and loss of fuel
Triple bomb balloon - Causes more serious damage and additional loss of fuel
Barrel bomb - Just don't hit this!

Reward Video
By watching a short video you can upgrade your balloon to have more fuel or water. You can also refill your current fuel or water or get ammo for your weapons