I had a feeling I was gonna enjoy your game after some of the stuff I saw you posting on Twitter! Not just because I love your art, but also the general premise was very intriguing from the stuff you were teasing. Definitely my cup of tea :3
The atmosphere had a lovely sense of longing and melancholy and I found it quite calming to play while still feeling as though it was eerie at the same time. It kind of reminded me of this old PC game I played a looong time ago called The Void I think it was. I know they're not even remotely the same type of game, but somehow the atmosphere gave me the same feeling as when I played that all those years ago!
I guess I should put the rest below:
SPOILERS
I managed to reach the end and enjoyed its bittersweetness :3 I thought the story and the way of telling it was refreshing to go through as well as oooing at your pretty art, haha.
I'm not sure if it's a bug or not, but even though I saw the CG with the red shade in the cage, it didn't unlock in the gallery with the others. And I loved the title screen change at the end! Also, I'm not sure if it was a bug or intentional but after getting that last ending, I went to the gallery to gawk at your beautiful art again and the gallery sign and return button were there, but all the slots where the thumbnails would be were just white. I hadn't checked the gallery previous to that, so I have no idea if it was intentional because I mean, it would fit with the aesthetic because it was white/blank. And it's not like you couldn't access the CGs because if you clicked in the right place, they still came up. It's just the thumbnails that were invisible. I deleted the folder from my appdata to see if that made any difference, and when I reloaded the game, the thumbnails did appear as usual, but I still didn't have the CG from red.
Anyways, if it is a bug, it's only a little one! I just thought I'd let you know in case you weren't aware of it. Really loved both the aesthetics and the atmosphere :3