>>543386845
lastly, i've wrapped my head around the final boss. if you didn't collect every egg in the previous chapters, there would only be a rematch with the roaring knight that essentialy ends with you killing it and then "feeling nothing" afterwards. nobody is saved, the world becomes pure emptyness, and deltarune is over.

but if you do collect every egg in the game, a door will be revealed and each egg will be placed in it like the six coins in mario land 2. mystery egg (gaster) would be the final one, and leave your party permanently in order to open the door.
inside of it, there will basically be a fight against dess similar to the secret mari fight in omori. the twist being that, at some point, there would begin a new phase, and then the actual final boss of deltarune would be revealed, but i haven't finished the design yet so i will reveal it later alongside what would happen in said fight.