I just realised I never actually reviewed this book and found my review in drafts 0.0 WHOOPS Well anyone who knows me probably knows my love for this book but here you are anyway XD 
 I love it, I love it, I love it - The whole book just blew my mind, it's everything I could have hoped for and so much more. 
 Gemina is everything I want in a sci fi: Kick ass characters, sass, banter, killing, space talk, epic action, race against the clock (I have realised that those pages with the count down? Yeah they give me anxiety and I'm not even in the god damn book), Artificial intelligence, super cool computer hackers, missiles, drugs, and cows, freaking cows. 
 I didn't know how the amazing Amie and Jay could top Illuminae but they did. Still told by a series of IM chats, headset convos, transcribed video recordings, and the main character Hanna's drawing diary the formatting takes it above and beyond. Marie Lu's artwork is beautiful, there is a gunshot that is at the corner of the pages with a blood stain slowly getting bigger which continues to freaked me out the whole time as I was just waiting for the book to get shot, the whispernet convo's and ALL THE CAPS convos are just THE BEST, hell I even want the audio to the lollipop song because I'd like to be annoyed with the rest of the characters. 
 Okay I can't speak rationally about this books it's just to good so sorry everyone that hasn't read Gemina (P.S GO READ IT NOOOOOOOOOOOOOW) 
 My serious god damn reaction all through the book 
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 WHOOOOO I like the new characters 
 Ohhhh Drug dealers and space mafia wasn't expecting that 
 Hanna you amazing girl your drawing are melting my heart pls go on 
 Nik and Ella's banter is THE BEST 
 ^^^^ all caps *pew pew* 
 OH GOD don't give me a count down till the Hypatica arrives this is a different type of torture 
 Vent crawling would be super hard work, also I'm glad to see oh characters sleep and try to eat and go toilet 
 JACKSON! *punches Jackson* but is also relived because Nik *heart eyes* 
 Ella's logs and her talk to her bestfriend was cool and I must know who this friend is 
 The descriptions are wonderful I mean un-colours and not colour as a descriptive word doesn't seem like it would work but it did 
 When they spoke with Kady for the first time I may have yelled 
 When Aiden showed up O' Captain, My Captain how I love that crazy computer 
 When Nik Died! *screams forever* 
 When Nik didn't actually die *scream in happiness forever* 
 The whole chapter that reads from Nik's and Hanna's responses at the same time *mind blown* 
 Reuniting with everyone 
 Ella saving them 
 Jackson Killing them 
 Jackson not actually killing them 
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 Not only was this book just phenomenal, it's making such waves in the reading community and is getting so many people interested in reading. The formatting makes this book the best thing you could ever give a young kid who isn't to keen on reading.