Overall, I really enjoyed reading this book. The plot was very engaging, and I liked how the author was able to add the science fiction element of aliens to Maddy and Grace's sleepover. I also liked how throughout the book, Maddy and Grace stayed very open-minded even when they were meeting the aliens who were very different than them. The author did a great job of using aliens to represent things that are different than us, and I liked how Maddy and Grace were able to find similarities between themselves and the aliens by the end of the story. This book showed the importance of being kind to others even if they are different than you, and how we are all more similar than we think! Lastly, I enjoyed the colorful illustrations in this book as I think they helped me understand all the new settings in this book such as the spaceship and different planets. This is a great book for young readers who like Science Fiction!