Caribdis, I'd like to commend you for this marvelous game. The story line is well-written, the omnipresent hints towards Greek mythology are fantastic and well-researched (Calypso to be found in Ogygia, just like in the original myths). The only thing I'd wish for were a game not based on Manga/Hentai based aesthetics. Game makers could draw so much influence from European 19th century symbolism (Arnold Boecklin, Franz von Stuck, whose art was highly erotic). Focussing more on occidental art traditions instead of looking toward Japan would make your game unique, imho. But I assume I am a minority with these thoughts.
Well you could probably try treasure of nadia?Its a pretty long game and is actually one of the best out there..It is part of a trilogy where "Lust epidemic" is the first,then there is "Treasure of Nadia" And then the last one which was recently released called "Genesis Order"..As far as i know Treasure of Nadia is heavily related to Aztec and Indian legacies and stuff so definitly check it out