My story also has a brief torture scene, though it's no worse than you'd see in a lot of PG rated films. Most of the stories contain the occasional swear word but pretty much blink and you'll miss it
I think the target market is essentially aimed at all ages despite some of the content. The idea is to bring the Elite universe to as wide an audience as possible, though that is largely limited to Elite and SF fans in general at the moment.
As for sequels, we're all in the same position - patiently waiting to see how things go. All of the books written so far are to a very high standard, so we've all got our fingers crossed that more can be produced in the future. One step at a time...
Edit after consultation: for clarity, the reviewers make their own recommendations as to target market based on suitability, so they will still recommend a book if they think a teen market will pick it up. Mild/moderate swearing and some mild sexual content in older teen novels is actually fairly common.
Some teen books are pretty explicit in all areas (drugs, sex, violence) they don't hold their punches. Have you ever read the teen book "Junk"? That is very explicit for a teen book, makes the Elite books seem very tame in comparison.