What should a one-button game contain to attract players?

Hi everyone! I decided to make a top-down game which can be controlled with just one button. Like, movement, attack and anything else is controlled by clicking the X button (so you basically need to press X to win, heh). It is quite interesting to experiment with such idea, but... Boy, marketing such a game will be a nightmare! It sounds like a browser game from the past and I have no slightest idea if anyone will play it nowadays. Perhaps your advice will help me to understand what I'm actually trying to make. So...

Imagine you found a one-button-game on Steam for, let's say, 3-5$. What does this game need to contain for you to want to buy it? Just describe anything that would be interesting personally for you.