This game is gorgeous. Special shoutouts to the balcony room, both versions (but especially the dream version) have a wonderfully uncanny feel. Maybe I'm just too attracted to tall buildings and odd empty architecture.
My other favorite area is that lovely meadow with the flowers and puddles of rain.
[Spoilers]
I don't know if I discovered everything, but I wonder if Yamaiko was involved in a car accident of sorts and is now injured or dead... This is based mostly on the crashed car you can find in one area, and the 'Necrotic' effect you can obtain from another. The heart rate monitor is very ominous, as well.