I think it's definitely a character-driven story. The specific teenage-slice-of-life thing is present throughout a good chunk of it, because the POV character

I think it's definitely a character-driven story. The specific teenage-slice-of-life thing is present throughout a good chunk of it, because the POV character is a teenager, but that does change somewhat, if only because she gets older. That said, I found it amazingly fun basically from page one, and while romantic-drama-ish moments were a focus throughout, I also felt like "cool superpowers exploration" was a focus throughout. So while I think it might "get better" about the things that bother you, I can't be certian, since I liked it from the start :)