The idea here is to park your car in as few moves that you can do. There are no secret in this game as it just depends on your skills to park your car. The scenario on each level is different from each level. You will see that the timer keeps on increasing, but it is only important if you are after the bonus that you can get from parking early.
Try to park your car as fast as you could without hitting anything on the game. The game is not as easy as you think it is since you need to park within a few moves, but that is not a prerequisite for the game.