If you don't mind ones that are only in Japanese, I can name thirty or forty truly epic games, but I'll start with ones that are just generally good: Harumade Kururu (this game starts like a harem nukige and turns into a serious mindfuck), Evolimit (any action game by propeller really), Ruitomo, Comyu, Dies Irae (for its unrepentant melodrama), Hapymaher, Grisaia (the first one), Haruka ni Aogi Uruwashi no, Jingai Makyou, Komorebi no Nostalgia, Otome ga Tsumugu Koi no Canvas, Sousei Kitan Aerial, Tiny Dungeon series, Draculius, Tsuisou no Augment, Vermillion - Bind of Blood. I could go on further, but I won't.