These are unused sprites for @KDT123 's "The Long Walk" They do work if you touch your mouse pointer (or finger, if you are on mobile) on them. The Fish is an extra life, the Coin is.... a coin... And the Cat Food Tin had many purposes we toyed with. Points, Extra breath (like the coins underwater in SM64) All manner of things. But due to it still being a Beta, they are not used.