fortunately, the dev realized that it was too subtle. so, they... made it shake every once in a while! this is effective at drawing your attention to it, but not at signaling that it's clickable. and once you've played more than one or two games and understand that it's there, the shaking just gets annoying. that's right, the shaking never goes away! it just shakes every couple minutes, no matter what (at least as far as I can tell)