Press space to boost, and arrows to move. Try to avoid the asteroids, but reach the edge.
The game relies heavily on luck. If you fail, don't rage-quit, just click the flag again. The size of the ship and placement of the asteroids are random. Try turbo mode for a real challenge. Sometimes, the game can be WAY too easy. NOTE- You cannot boost and win at the same time. Disable boost to win. Using boost for more than 2 seconds at a time disables it, with a cooldown.