Wow... this is so beautiful! The basic idea fits the main theme really well, and you managed to work all the optional themes nicely into the story.
The characters are very endearing. Well, I can't stand that one "gentleman", but I suppose that is intentional. I also like the perspective that the odd young lady brings to the mix. And when I got the choices right on my second attempt, I actually teared up - it's so heartwarming to see how the memory trading affects the characters.
The music is very fitting and pleasant to listen to. The environment looks nice and cozy, and I like how expressive the characters are. Great work overall!