There are 2 modes. You can press the space key if you want to use your mouse. Press the right and left arrow keys and you will see that it will move left and right.
Modes can be switched during the game, you can press the space bar and use your mouse if you are done with the 2nd mode (the left and right arrow keys.) Or you could the opposite. If you want to use your mouse pointer at the start of the game, press the space bar first, the mode of the game starts with mode 2.
