It's the only visual novel I've ever played, but it excels so much at it. The writing, worldbuilding, characters, narrator, and overall "vibe" are fantastically superb. It's also another one of those games that I can't help but play for ~5 hours nearly every day until I finish it. I'm no video game connoisseur, so you can find more sophisticated reviews elsewhere. You can pick it up on GOG for like €10 half of the time.