As much as I loved Illuminae, as much as I found Gemina to be difficult to read! There were absolutely too many characters to fully comprehend the story! What made it WORSE was that most of these characters had battle nicknames and throughout the story the narrate would switch between the original name and the nickname and I could honestly never remember any of them except the main characters. 
 I even forgot Jackson since he had a nickname which I forgot as soon as I read it. 
 The story itself was complicated and wasn't easy to read, but it got interesting during the end with quite an amazing twist to the story. I wish that twist was explained further but the author decided to keep it at a summary, probably meaning to refer to it again during book 3. 
 I loved the charisma between Nik and Hanna and I can honestly say that I love them as a couple. 
 Ella and her goldfish are ADORABLE. 
 I definitely was happy to see AIDAN in this book since I LOVED him/it in book 1.