The angel? you mean this horrific red creature who give you the worst ending? Did you saw the name in files?
If so, I can say Sei is the same kind of angel we see in Undertale
Yes, the name is in the files. Event name of the angel is SEI, character sprite is $SEI.png and the worst ending screen picture is Sei_Screen.png (or something similar).
Thx!Also I made a topic about avoiding her without taking the doll.
