Kate Stone borrows the children's game "Simon Says" and turns it into a picture of the pressure to look a certain way. In the game, you do whatever Simon tells you. Here, Simon gives orders about the body: be thin, have clear skin, have long silky hair, be perfect. Simon isn't a real person, so he seems to stand for the voices of society, media, or peer expectations that tell people, especially girls, how they should look.
The commands pile up in short, flat lines, and the repetition of "Simon says" makes them feel relentless and bossy. The demands also grow bigger until the final one, "be perfect," which is impossible to meet. Then the tone shifts. The last line, set apart from the rest, is the speaker's answer: who cares what Simon says? The mood moves from pressure and exhaustion to defiance. The speaker's choice to "lose his game" is a small act of freedom, since losing here means winning.