I just finished all the endings and I'm left speechless. The best way I can describe this VN is that it is hauntingly beautiful. The narrative is really well done and Edgar's ending especially got to me.
[Spoilers]
I think the biggest proof to me that this is well-crafted is the fact that even though I had accurately guessed what Edgar's "I want you to..." was going to be, it still had me reeling after it was said. The fact that I can know what's coming and still be emotionally affected is amazing. Overall, I love how this VN encapsulates the different reactions to "the end," and how everyone does cope in different ways. I think it's great too that the cause is never explicitly stated, which leaves perfect room for the reader to imagine it themselves.
Really well done.