It's hard to write a review that doesn't cover what's been written before.
This anime, like most, suffers from typical anime issues. A young person is thrust into the spotlight to lead a group (or themselves) out of danger. They're initially shy and awkward, and then an episode later they're running around like they own the world, being impossibly awesome. It also has the same basic issue of static images with monologue look like stills, and it's hard to know whether the dubbing has been extended from the original or not, with a single frame paused to provide the additional time to bore us all with exposition. Add to that the 'surprise face' that the main character has and the 'oh, uh, ooh, waah' that we're constantly fed, makes me wonder whether this person is a newborn experiencing everything for the first time.
As many other reviewers have pointed out, the art work is great, and initially drew me into the show, however the show is let down by almost everything else. Including the basic plotline that just doesn't make sense.
Like, why is there a whole civilisation living on a barren frozen planet just to mine some special rock? If it's a penal colony, does there really need to be a whole city? How did the city get built if the air is toxic? Where do they get oxygen/nitrogen from to breathe? If it's a barren rock, why does the main building have a massive defence system? How come the tardigrades start to explode outside but not when shot hundreds of times in the mine? Why make this special mineral into little cubes that need to be fed in to machines like coins into a slot machine?
The plot conveniences are numerous and just go to show that, sadly, people can not write TV shows anymore.
If you're bored and really need something to watch, it's ok, but it's not going to win any awards for excitement nor originalism. Ah Netflix, you've done it again.