During the ending, you can save on the overworld maps with Ayla and Glenn and still fight some monsters around. This is kind of unconventional for an ending. Wouldn't it be better if we block access to the overworlds? We could have it so that when Ayla leaves Mystic Mts she directly arrives in Singing Mt, and when Glenn leaves Truce Canyon he directly arrives in Guardia Castle. We could also hide the monsters in that Canyon.