@ArthurHFSS Review completed! Your novel is really great! The only thing it is lacking its more promotion! Just select some of the people in this thread and talk to them to trade reviews so they would promote your novels.
Also, and I am only pointing this because you said you want feedback, your synopsis could be better.
You do have a great start in prologue and first chapter with Earth destroyed by tentacles, so why don't use that in your synopsis. Write it in a little more agressive way. For example:
"Damn tentacled monsters! First they destroyed the Academy. Then they destroyed the Protectorade. Finally, the whole Earth! And that was just graduation day! Can John survive his first day as the interim captain of a broken spaceship?
Armed only with his dubious expertise and a worn out Terrene Protectorate Field Guide, he will have to avoid the tentacles trying to kill him, repair his ship, protect the symbol of a defunct organization and find out the responsibles of the destruction of Earth before he can even start to think about revenge.
Oh boy! How much he wished he had paid more attention instead of sleeping on his bench during those all those lessons at the academy!"
Something like that. I hope you find it useful. You are entitled to ignore my advice if you dont like it.