How do these scenes not point out that he's running Deltarune like it's a simulation?
It's going to be some dumb timeloop ending where (You) the soul somehow got into the game and were able to create another ending despite there only being 1 ending.
This is Toby's dumbass "fever dream". "WHAT IF MY SOUL GOT INTO THE JRPG AND I COULD GET ANOTHER ENDING!!!!!"