OR you could add a secret way to win maybe and we get to keep the cool swords we find? :p
(Ngl I thought something secretly cool would happened if I managed to beat the Earth Goddess phase 2)
I was thinking maybe another card as a possible reward?
Card Ideas: Maybe wall on left and right of card, 7 on top 5 on bottom? (kinda broken but not truly invincible, pretty worth it for a card so hard to get)
Or maybe walls on top and bottom then any numbers of like 4-5+ on the sides? or for all i know it could be the 2nd card to have walls on all sides. which would be rather silly.