Tap on the Screen to fly the balloon upwards, avoid crashing with obstacles by moving the phone left or right or dragging the balloon downwards.
Obstacles such as birds, airplanes, asteroids and planets will keep coming in and you are bound to fly high if you keep avoiding them. You can even drag the balloon down to pull it back when needed.
Plan your tap speed and keep flying high.
If you crash, you can watch an Ad and resume the game from where you left off.