I've seen others mention Ripples, Pale Carnations, I'd also recommend Mist, its not Honey Select, but custom stylized models that are pretty good and has an interesting story. Of course Once in a Lifetime doesn't even need to be mentioned, but might as well. It looks older but still very good quality and story by Caribdis.
Would also recommend Projeckt: Passion, Oppai Oddysey,and Desire of Fate. It's hard to beat everything Eternum has but these games all share similar traits in different aspects.
Something a bit more serious but high quality would be Desert Stalkers, very different from Eternum but good story, characters and worldbuilding.