"space" to change between menu and editor
"w" to to toggle the physics engine working (pause)
"s" to stop the game
"a" to start the game
"r" to reset the game
"click + hold" to control the balls
"option/alt + click" to add a square
"n" to add random squares
"b" to add a cloud of balls
"shift + click" to create walls
"v" to add a vortex in the middle of the screen
"f" to add a black hole in the middle of the screen
"c" to clear all black holes and vertices
"m" to switch to screensaver mode. Tip: Use a vortex and a ball cloud with this!