Space changes color. The I key inverts the dark and light dots. H hides the non-lit dots.T key toggles 12-hour and 24-hour time. M toggles music on and off. K and L shrink and enlarge the clock. Left and right arrow keys reverse the scrolling direction. Up arrow changes the backdrop. Down arrow pauses the scrolling. WASD tilts up and down, or shifts the left-right radius. Q toggles mouse control on and off.
BIG shout out to @ivan321 for the original!
