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Good and evil points? Hmm... that's something inexplicable. They will probably serve as resources.
1. Demanded a larger reward - evil
2. Simply took the reward - neutral
3. Refused the reward - evil
And the ending will be determined by the number of points, with the ending corresponding to the side with more points. I won't be surprised if the endings are in the spirit of:
Evil - ahahahaha, you are the dark lord/helper of the dark lord, and the world is at your feet.
Good - you saved the world from an overpowered demon, everyone thanks you, considers you a hero. All races have united together - peace, friendship, and chewing gum.
Neutral - there are no versions about this one.