As there is technically no explicit percentage for completion in this game, I don't see why there needs to be % at the end of every category. They are arbitrary since there isn't a conclusive way of finding the percentage of which the game is completed after completing a category such as Game Over, or 10/10.

Basically there's no need for % in the names of the categories if the game doesn't explicitly state that you have completed this percentage of the game by doing certain tasks

I agree. Done