I started out excited about this premise, a futuristic Earth with a couple who are drifting in space with only 90 minutes of oxygen left. Sounds like one I wouldn't be able to put down. Unfortunately, it didn't hold my attention. I liked some of the moments between Carys and Max, but the rules of Europia didn't make sense. I completely missed the set up forewarning what the ending would be

Spoiler

multiple endings like a chose your own ending

. I think I would have liked it a lot more if the world made more sense and the ending was better laid out.