I really liked this game, both for its visuals and its soundtrack. I still have the main theme stuck in my head, lol.
Beyond that, I enjoyed the characters a lot. At first, I thought it would be a typical yandere romance, but when the first death happened, I had to take a step back.
"Wait, wait... she's alive?" That's when I realized she couldn't die, which explained why she didn't care about it.
I had fun reading about their dates and how normal they seemed in public, but then there were these small moments of unhinged behavior from both characters. The reactions from the "normal" people were very entertaining to watch. For me, the selling point was their discussions about living forever. I often ponder what it would be like to live forever, and this game represents that idea well.
I guess living forever would slowly but surely drive someone insane unless they lost a bit of their humanity along the way. I like to think these two characters live forever and that the game takes place over years rather than days. That's why we can go on forever with the dates, and even when they repeat, I personally didn't notice.