Though obviously taking the theme to likely its most extreme logical conclusion, it's clear that there would have been many ways to be tempted even a bit in one direction and add something else that wouldn't have been necessary.
Thanks for inspiring me by reminding me that polish can also come from deliberate inaction and restraint (or, at least, the forethought and planning to make it that much easier to be restrained later in the process). Cute little thing already, but if you did want to take it past minimalism, I'd encourage you to continue the emotional spirit of this simple game into a larger version. : )