Deltarune, released in 2018, is a role-playing game that has been praised for its engaging narrative, memorable characters, and innovative gameplay mechanics. Developed by Toby Fox, the creator of Undertale, Deltarune offers a similar blend of exploration, puzzle-solving, and combat, but with a distinct twist. The game features a strong focus on player agency and choice, allowing players to shape the narrative and make meaningful decisions that impact the story. This paper will explore the ways in which Deltarune's use of player agency and choice contributes to the overall narrative and player experience.