Use the "a, s, d, w" keys to move the marble (make sure capslock is off!)
Use "Shift" to run and "spacebar" to jump (although technically, that would be cheating...)
If you lose the marble by accident, press "r" to reset
Use the mouse (click & drag) to move the camera
Scroll to zoom in/out- Make sure to take a close look at the pretty marble!
Note: If zooming doesn't work, try moving the mouse away from the center of the screen. Not sure why this is happening...