You play as a small green blob, Slime-San, who is gobbled up by a giant roaming snake. Your goal is to make your way through the massive serpent in the hopes of getting your freedom once again.
As soon as you start Slime-San, you are greeted with a distinctly retro graphics style. Not only is the world filled with pixely sprites, but the low color palate brings back memories of monochrome monitors. Of course, Slime-San doesn't actually restrict itself to a single color, but there aren't a lot of different shades at the game's disposal and it uses those few different colors to good purpose. Besides some coloring for the various characters you will meet, the colors green and red will be used prominently to either denote danger or an object Slime-San can morph through. More subtle shades of these colors can be found as well, but they all work together to make the retro-feel even stronger.