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Sayonara wo Oshiete if you don't mind an untranslated title. It's probably the representative Denpa horror VN. Also, I second Swan Song.

Tokyo Babel for action (Dies Irae and Fate both only get action-y relatively late) Even though this isn't translated: End Sleep for horror

Hmm the ones I'd recommend you have already played/started playing and, I might add, given bad scores lol You could try Swan Song - it's not horror, but instead a very depressing post-tragedy story.

Late to the party here, and I'm sorry about your situation there. As for the recommendations, I would say that all of the above are the good ones. So let me add some new one such as Saku Saku, Noble Works, Daitoshokan, and Koiresort here. Also seeing that I already recommend Hoshiori to you, let me recommend it once again to you and I think it should be the closest one to what you want. I hope that my recommendations here will be helpful to you.