1) Nice idea but story is poorly executed and writing is weak. (0)
2) Character personalyties are average, same with their look. (0.5)
3) Sex scenes are rarely animated, some are not bad looking though (0.5)
4) Sandbox thing is not bad, great freedom of interactions... but feels totally empty cause lack of content (0.5)
5) Not much of content, abandoned. (0)
So it's 1.5/5, lets add some (0.5) for nice idea and some freedom, so 2/5 it's worth.
2) Character personalyties are average, same with their look. (0.5)
3) Sex scenes are rarely animated, some are not bad looking though (0.5)
4) Sandbox thing is not bad, great freedom of interactions... but feels totally empty cause lack of content (0.5)
5) Not much of content, abandoned. (0)
So it's 1.5/5, lets add some (0.5) for nice idea and some freedom, so 2/5 it's worth.