Well, the Tsutomu Nihei expert enters here.
Episode 1:
This felt like a mix between classic shonen mecha show and some elements of Nihei. To be honest I would have prefered much more of the latter and less of the former because despite those elements it still felt very generic, but those details made this was more enjoyable.
To sum up this author and other works, he loves (and I mean LOVES) drawing structures, backgrounds and ambients, especially with a dirty (in a good way) and cyberpunk style. This with the cyberpunk style and some brutal fight scenes, he usually does his stories, characters and dialogues too minimalist, working sometimes or not, but usually not being the main focus of his works (and to be honest, I think he is self-aware of his own qualities and defects). And he usually likes starting in media res and without exposition or explaining anything to the viewer (in fact, I think many times he doesn't even try to do that, you have to learn by conecting all the hints every dialogue has when you re-read), but that makes all his setting and world more fascinating and with a charming and inmmersive feeling.
Now, this work... has only a few of these elements in small doses. It doesn't have anything of his dirty style, but you can find some of his loved designs of the city. The setting and story feels generic, but the way they give you information is still very implied with many hints here and there (the photosyntesis, those obvious clones, the fact that Sidonia is a giant pipe piercing a meteorite, etc.). The characters are bland, which is not surprise, but here they have more stereotype personalities and it seems they are more the focus (in other works even the main characters were more intentional blank slots not being that much the focus), which is my concern because I don't think he's good in that and this episode shows it too.
About the episode itself, it advanced a bit too fast and convenient, but it worked okay enough. I don't know how much fun the battles will be but I hope he can be as brute and fun as his other works. So as a whole, I thought it was okay, although I feel kind of disappointed with the typical shounen direction for this author, it just looks inadequate for him.