I liked it!
First and foremost, though, it's a romance. Technically a romantasy but mostly a romance. The world building is... meh. Like it's there, they're clearly not on Earth, but it felt circumstantial rather than deliberate. So much set dressing for the romance. It's fine.
The plot is decent. It's a mystery. But again. This is a romance. The plot was there to provide conflict. Overall I'd say the plot is nothing to write home about. It was decently entertaining. It definitely got more interesting towards the end, which was appreciated.
The passage of time was sometimes difficult to keep track of. A lot happens in a very short period of time.
This sounds like damning with faint praise but what's important is that the romance was very very good--good romantic development, paced well. Despite some anguish on characters' parts, I never felt like I wanted to shake someone …