On Google Play
The point of the game is to get through as many of the checkpoints as possible in the time limit you have. It requires you to put your ship in an orbit that will hit as many as possible or just fight against the gravity of Earth to reach further away checkpoints.
Google Play Games Leaderboards
I have also added a leaderboard to the app which allows you to submit and compare your score with others around the world.
If you try the game, please provide feedback as a reply to this post. Any feedback is appreciated and will help a lot. Thanks.