//This is the method for start the game
private void StartGame()
{
//initialize score text and amount
scoreText.text = "Score";
scoreAmount = 0f;
pointIncreasedPerSecond = 1f;
//if the game state is Stop, start the game
//set game state and hide buttons and title
gameState = GameState.Start;
GameStart = true;
//prevent from rotating
player.rigidBody.freezeRotation = true;
//start run
player.Run();
}