A very interesting short story ~ I liked the creative use of the sprite and mask going between the two characters. I thought that was an interesting way to have this conversation between Momotarou and the demon. I think the concept itself is interesting. I always enjoy Faustian bargain type scenarios. So I found the character interactions really intriguing.

My only major constructive criticism is I'd like a little more clarity in terms of exposition. I felt the narration (or rather lack of it) was being vague on purpose. Which some readers might enjoy, but for me personally I was a little confused. I didn't know how to roleplay and make choices from Momotarou's perspective without having good grasp of the situation. However, I know the word limit restriction makes this a struggle. Even a couple sentences at the beginning summarizing the situation from Momotarou's perspective—for the sake of making sure the reader and Momotarou are on the same page—would've made a world of difference. At least for someone like me who wants to know more about the lore and backstory of the characters.

Aside from that, I did enjoy playing and would love to see more!