Thanks for playing! I'm happy to see you enjoyed my game.
My game might look creative and unique to you, but I have to mention that many parts of this game is based on player feedback. For example, the TF description is added after receiving a feedback from TuxedoedPenguin, and the ability to 'infect' transformation between party members is based on nivada94's idea.
For the final boss battle, the idea to force the player to use multiple parties was there since an early stage of the development. It didn't necessarily have to "a champion party first, a human party later", but it was the easiest to implement.
Humans' immunity to petrification is actually noted in one of the books found in the tavern's basement. But, perhaps I could use this "a charm that protects one champion from the final boss's curse" anyway.
I'm actually planning some more changes on this game, but I'll make sure I won't break what's already there.