My theory is that deltarune is undertale backwards, becuase of the bosses mainly: Asgore: end of ut, King: beggining of dr, Mettaton = queen, Mettaton box form = Tenna, Undyne = Gerson. with this, Asgore in chapter 5 is mad dummy. and guess what! Papyrus is next, my guess: the knight will be chapter 6 boss becuase Papyrus, meaning the last boss is either flowey, napstablook, or flowey based.