Give a list of commands on the front page

The game is nice, but it does not provide the necessary direction at the beginning, especially with the ball hidden. Without knowing it uses arrow keys rather than mouse, the game appears broken while the lack of an exit key is making many people crash it rather than closing.

I would suggest providing the following on the page where you start the game:

1) List of controls (i.e. arrows or WADS).
2) Exit = F2
3) Note: The marble may be hidden from view sometimes.