First time to play this VN. Took me about 14 hours to finish it (yes, I played it in a day).
The moments that most amazed me is when Killigan become a bird in his 'dream'. No matter how I see the temple, based on the it's architecture, it's obviously Hindu temple (and I almost suspect it was Angkor Wat or Prambanan temple). Such a surprise! The way you construct their culture is astonishing!