This is great to masterpiece tier. I am sadly lacking the words right now to express my thoughts, because I have slept too little last night, but I'll try to give a small summary. The main selling point of this story is the characters and their relationships. And that is done beautifully. The worldbuilding, while rather basic, is slowly being revealed and added to with each new character, loop, or story told, making you think and wonder.
I do really like this and hope for more.