Pico-8 renders that button sprite, but it supposed to be the 'whatever is next to your x' button. Sometimes that's z, sometimes y, sometimes c.
I wanted to use X as an overall skip action button, and C as a menu management button (selecting option), as in Pico-8 you have only two action buttons, but gonna look into changing the two buttons, and how that changes the overall gamefeel.
Thanks for the review and the comment!