Press Space for next build. Once you get to the end you can't go back to the beginning. Like it says at the end, If you want me to build more undertale stuff and put it on this project, put them in the comment section I might build it and put it in this project. The builds are a bit stretched in this project so in reality, they're a bit smaller.
Updates 27/02/2017: Only 2 creations (Sans and Papyrus counts as one). Just released.