Start with space key. Control paddles with up/down arrows and W/S keys. 4 speed levels are possible with arrows left/right. In the common versions of this kind of games it sometimes happens that the ball gets caught between edge and paddle and keeps running back and forth for a while. This glitch causes lots of unwanted score changes. To prevent this I made in this case the ball stuck until the paddle is moved away from it.
Credits to @spaciousmind for the basic idea of a moving eye. Thanks to @ggenije for the maths in the eye movement controlling code.
