Nox Online? No, I'm not deleting that, because it's had many replies.
You imply that it's still the same game, albeit one that has been improved. It therefore belongs in the same thread. Just update the first post and you're fine. One thread per game is the rule, and you already have a thread for it.
Would it possible to delete my thread in the Progressing Games section?
I would like to start a fresh brand new thread in the Games Showcase, my project has had massive improvements since then and new features.
Threads aren't deleted unless it's very specifically requested by the creator (and even then it's not something that's done lightly).
The Progressing Games section only shows all threads that have been active within the last 2 months (because posting in a more inactive thread than that is necroposting and against the rules). The last post in your Nox thread was in November, so it wasn't displayed by default. There are options at the bottom of the section to display more (or fewer) threads if you need to, but in general I don't advise it because of possible necroposting.
You can also look in your profile page and click "Find all threads started by khkramer" (in the Statistics tab), of course.
You are allowed to bump your own game threads, even if it's been inactive for more than 2 months, so long as you're providing some kind of progress report or update or new information (and not just bumping for the sake of it).
You're far too impatient. You posted your thread yesterday. The rules say that thread approval can take up to a few days, and to hold off contacting the mod (me) for at least that long.
Now, having said that, what makes Genesis any different to Nox? The change of name? The slightly different style of buildings? That really doesn't sound enough to warrant a whole new thread. Just update the first post of the Nox thread and ask for a thread name change.