Really nice atmosphere! I liked the lighting and the pixel art, but I loved the piano music in the background.
I stumbled upon a bug where the camera moved faster than the player in one of the rooms, leading to many forced deaths, but I saw that someone else spotted that before so I answered you there with what I think the fix for that bug is.
Two more minor things that I think can be improved would be the player controls as they felt a bit wierd (for your future games definitely take a look at mid-air movement more) and i also think the speech boubles where a bit small.
Again these are minor adjusments that I would make, but definitely not something that hindered my playing experience, they were just some tips to keep in mind.
Overall the game was pretty nice, and I enjoyed the story very much!