The back cover I'm currently working on

Ok, book covers are decided, this is to be the back of the book, if I am correct, and I am allowed to post anywhere to get feedback.

And some feedback would be nice to get, on any of the platforms you've seen this through. :)

Anything you see that flies in your face as wrong? Those flying things are at the moment currently under "reconstruction" which is why they're slightly on and off on this one. Thank you in advance. :)