I would say that this VN perfectly done for bringing the story. NSFW often labelled as adult/mature content but 'adult' and 'mature' is different things. This VN told us what it mean by being 'mature' is, instead just some sex scenes that we hoped for.
My suggestion: in gallery, I didn't found 'previous page'. In gallery too, it's better to replay the events instead just show similar illustration with different expression.
I put high expectations on Khemia and others Echo Project's projects...
Cheers!