Beautiful with quite some powerful emotion to it !
I like the story you told here with the memories to collect :) And i really enjoyed the little detail of the game boy part having the piano music becoming part of the game within a game and turning 8bit like
Visually i like the fact that you used the lighting and camera movement in a very subtle way, and the haertbeat mechanic is well made in the sense that it doesn't detract too much from the platforming itself while still being part of the main gameplay loop.
If i had to nitpick i'd just say the elevator part is a bit fast when you don't know the layout yet, i died a few times there, and the part where you have to jump on the real tiny platforms was a bit hard to land.
Regardless i enjoyed it.
Good job ^^