I'd come to terms with them calling stays a corset but I got the rage when a man in regency England went to a bakery for some sugar cookies!
Apart from these linguistic crimes, I really enjoyed this. The chapters switch between the two main characters POV and they both had a very distinctive voice, one very YA and one very Austenesque. I think the fact she'd got the tone so right for Lucy made the occasional historical/ location inaccuracies of language more jarring. 
The actual romance was adorable and I liked how the two girls had very different experiences of realising they were queer and coming to admit their feelings for each other. I also liked that there were several romance moments that were straight out of Austen, we even get a wet shirt in a lake! 
The time travel element is fantasy/magic rather than sci-fi, which is always my preference as you don't have to worry about it making sense. I also like the idea of just messing with the neighbour kids by propelling them through time!
The romance is all very PG, Jane would approve, so suitable for the Janeites and the teens.