You launch your bottle by timing your first click to fill the bottle with as much water as you can. Then you have 10 seconds to pump the bottle with as much air as you can by clicking and dragging the pump handle up and down.
When the bottle launches you use your mouse to steer the rocket through the air avoiding obstacles.
You can collect boosts that open up a mini game that determines how much of a boost you get based on the timing of your click. Collecting these boosts helps continue your flight which leads you to your ultimate goal of breaking the earth's atmosphere.