Is it just me, or does this story seem to take aspects of Worm, the web serial, by Wildbow?
The powers of various characters, giant monsters, interludes, the name "scion" appearing once for a very brief moment?
Am I going insane or am I right?
You wouldn't be wrong. I have read Worm and enjoyed it, although it was actually recommended to me after Super-Nova began.
Interludes and some other elements of the VN like the post-bad end "advice room" were more inspired by Fate/Stay Night, but either way, I've absorbed influences from a number of different superhero stories, including Worm (I haven't gotten around to Ward though).
The basic premise and a couple other minor plot points, for example, were inspired by Dreadnought by April Daniels - a pretty neat superhero novel with a trans lead!