[After playing v1.0117]
Great adult game you actually feel like a game. As it happened with the previous one (Lust Epidemic - by the way, even being same universe and this being sort of a sequel, you can play Treasure of Nadia without playing Lust Epidemic first-), you will actually feel you're exploring and discovering things, having to achieve results in order to advance. Sometimes it can be a bit grindy anyway, and it wears off after a while (it is a long game, so it's a very long while). In that aspect I have to say Lust Epidemic was a bit better, it didn't reach the point you thought it was getting too long for its own good.
Porn element is great (in that, this one is far better than Lust Epidemic), specially for the first 2/3 of the game. At the end of the game you are probably even a bit bothered by the sex scenes, as you will think you've mostly just have seen it all and would prefer the story and the gameplay elements to don't be interrupted by the porn.
Overall, highly recommended, enjoyable for many reasons, and maybe just a bit too long.