Deltarune: Chapter 1 is a role-playing game set in a world where humans coexist with monsters. The story revolves around Kris and Susie, who find themselves in the mysterious "Dark World" and are tasked with saving the world alongside Ralsei. Throughout their journey, they encounter various "Darkners" and engage in combat through a bullet hell system, allowing players to choose between peaceful resolutions or violent encounters.

Players navigate through a prophesied quest to seal the duplicate Dark Fountain, facing challenging bullet hell attacks from enemies. Deltarune: Chapter 1 offers a unique gameplay experience where decisions impact the storyline, making it an engaging role-playing adventure for players on the PlayStation 4 platform.