Well I can hardly fault a project with such clear effort for being a simple demo, and then charging for the full product.
But I gotta say, it ended very abruptly. I can't say whether I'd be interested in making a purchase or not. I might recommend you let the demo get to whatever the gameplay loop might be. Providing there is one. See that's the problem with the current publicly available content, I have no idea what shape the game actually will take, the description promises more than a simple VN, but I didn't experience any of that. Show me the systems.
As I'm not interested in a pure VN, I'm not interested in making a purchase, cheap or not, you dig? Throw the player into a quick slice of a gameplay loop for the demo, story alone isn't enough, especially considering how little of that there was as well.
But what's here seems quality enough. Text flows well, characters look good, backgrounds look good, the porn was quality porn. I enjoyed the worldbuilding that took place. So I can recommend that people give it a try.