whether or not japan liked it doesn't really mean anything, dlsite reviews just tend high. moreover it's easy to be critical of small indie productions like most h-games when you aren't actually buying them, but for people invested in keeping that market alive it makes sense to view them with a lot of generosity. making games is hard, after all, especially so for solo developers/small teams with day jobs.
regardless, i think the reason i and most others didn't really find this game compelling is that it is just extremely inorganic. lots of scenes but every route exists in isolation and is very short, so the heroine's feelings never really come into it at all, which robs it of most of its appeal. it's difficult to deal with this many disparate relationships to begin with, but it might have seen more success in here if it was restructured to be a corruption game.