Young Adult.
Targeted toward the younger to mid teen. A kind of bizarre book that superimposes a seemingly normal group of kids on top of an alternate reality that seems to coexist.
It's the usual boy/girl, boy/boy, romance narrative. Coming of age. Kids are finishing their senior year and getting ready to go away to college.
It was a fun read. The kids are nice and not generally drinking or doing drugs and they take their academics seriously so they're decent role models without being too boring.
There were a couple of moments that would make it a bit uncomfortable for reading together as parent/child. Examples include a guy talking about his erection when he's kissing the girl of his dreams and he gushes enthusiastically about what sex with his girl-friend was like but it's not explicit. Otherwise I would say the book is pretty PG.