Good idea of a game =].
I stopped at 12, doing 20 souls straight was a bit much for me.
The main thing that bothered me was the size of the text. It was too small. I tried to play the game in full screen to make it bigger but couldn't.
It's cool that the dialogues are short, it'll be annoying to me to spend most of the game reading. It's a pity the souls are all the same colour, it gives me the feeling that it is the same soul that restarts each time.
I wonder what happens when we judge the 20 souls but the reward is not great enough to make me want to play longer.