I originally made this in late 2005, and it's still available on Kousou Games, but I have now remade it to run in your browser. Every last detail is the same (even the music!).
Being only one pixel high, the windowed version of the program looked like this:
But in order to make it actually playable, the fullscreen version stretched to fit; zoomed in so that it's actually four pixels high! Anyway, the original description is below.