I included that line as a request, not a rule, because I know that people will play this game however they like. I wrote that statement to express my intentions with its design and ask that they be taken into account—nothing more, nothing less. As with any polite request made by someone who lives in your computer screen, you are free to ignore it without fear of retribution.
Even so, telling people how to play the game is inherent to games as a medium. Games are what they are because of the rules by which participants agree to abide.
Also, I am giving it away for free; that's what the Community Copies are for.
Thank you for expressing your support, though I admit this is a rather odd way of doing so.