I'll work on the kong api.
As for the blank square, that's technically not a bug. the 32768 different invaders correspond to the possible states of a 3x5 grid which is mirrored vertically to create the invaders. Google 'invaders fractal' for method. The blank square is simply the state in which all cells are 'off'. The possibility of blank or having only 1 or 2 cells 'on' is why there is always the green background.
Would you believe that the when I first showed people the game they told me to make it harder?
That said because the mechanics are so basic I felt it was better for the game to end in 30 seconds because of difficulty than in 10 minutes because of boredom.
 "32768 Invaders"){kind=icon}