An extremely well-written and formatted devlog with a charming idea, well done. The only issue with the devlog is that while the characters and setting are expertly explained and illustrated through concept art, I am left wondering the specifics of the characters abilities, the actual puzzles themselves, and the interaction between the two (effectively the game mechanics were not fleshed out in the game treatment).
The art style and idea seem great, looking forward to seeing how this one goes!