That's the thing about creating. You really never know exactly who will like it or why they like it. You can push for a certain demographic, but everyone has a different taste and style, so everyone will approach your story and characters from a different angle.
All you can really do is create something that you personally would like to read. Try not to pander to audiences (it will be obvious) just to gather the most positive response. Be true for what you want.
Now for the lack of feedback, that may have to do with the size of your audience or what in particular is happening in your story.
If there's really nothing happening, you may not get a lot of response at all, or you may get people wondering what comes next.
If there's a huge plot changer going on, then you might get a lot of response, or a stunned silence.
It's very random, but that's just how feedback works.
The amount of feedback and the size of your audience will grow over time. It all depends on how interactive you are, how many updates you have, and how much exposure you have. Simply, keep working hard and more people will flock to you if your content is worth flocking to.