Horror vs Sci-fi - solution found!

I had been struggling with this for awhile now. My current writing project is post-apocalypse, set in the near future. It's very important to respect genre above all else, which I detailed in previous posts, so you already know about that. In a blinding flash of enlightenment, I realized what was holding me back and what was confusing me on the whole debate.

This story is not sci-fi, in the sense of Star Trek. No aliens, no new species, no new languages, or anything like that. However, the story does involve a decent amount of science and medical fiction. But it's not sci-fi...?

And then I realized what I use in this story is actually nature science. Something that I personally find fascinating, especially combined with the psychology of human behaviour.

Alas, Nature Sci-fi is not a genre. Maybe it will be invented once I finish this project and publish ;) But for the meantime, that genre doesn't exist.

So! I've decided it's best to call the project Post-Apocalypse Horror, sub-genres of Nature Sci-fi and Human Psychology.

I feel so much better now :D

And no one knows what the hell I'm talking about... *twiddles thumbs*

P.S I'm working hard on revisions for my website so I can announce the next contest very soon.

Science Fiction or Horror?

EDIT: Due to Google being a pain, I've had to change the comments setting to "anyone" and make word verification active again. Sorry, it's the only way I can allow anyone to post a comment AND avoid spammers.

I'm halfway done chapter 3, the rest should be done by the end of today. Fingers crossed, knock on wood, throw salt over left shoulder, and all of that.

I have an interesting question and I'd love to see some feedback on this. As we all know, my writing project is Post-Apocalypse, set in the future. I have noticed many times that Post-Apocalypse is not a genre within itself. The Stand by Stephen king is categorized as Horror. The Tripods by John Christopher is Science Fiction. Those two books are obvious, they're definitely placed in the right category.

But here's the question:

When dealing with a post-apocalypse story, what are the things that will define the story as Horror or Science Fiction?

Anyone?

Price Update

The ebook version of Eden Fell will sell for 4.50$ US. I'm pleased with the price, it's quite reasonable for an ebook of a novella.

The ebook will be in many formats, including Kindle. I don't have all the retail info yet, but I do know that one of the outlets for ebooks published with Damnation Books, is Horror Mall.

Prices of the print version won't be determined until closer to the September 1st release date.