First of all, I really the concept of the story. I am quite a big fan of sci-fi, so this was an enjoyable read. I wish you'd develop a bit more certain ideas, because I feel like it's moving too fast from one idea to another, and that takes me a little out of the story.
Also, in some chapters there is a lot of dialogue. This is not a bad thing, but I think it should be a bit more balanced with the description, with the inner thoughts of the character, to give it more depth. I consider that too much dialogue, without breaks, is a little tiring and difficult to assimilate. Of course, that's up to my preferences. Overall, you're doing a great job so keep it up!