Deltarune is already a pretty straight improvement on Undertale in every way. Better combat, more mechanics, better characters, better writing, and a layer of subtlety Undertale lacked. Nestled within the coming of age rpg tale is an ominous mystery. What is the relationship between the light and dark world, why is Rasiel alone, what is wrong with Kris? Deltarune is not a sequel to the pacifist run of Undertale; it is far better.