Where to begin with this show.
Story : Its muddled to say the least. The writers dont have the competence to give you any motivation to continue watching. By that I mean that its very hacked together. There is no flow to the narrative.
Characters : In the first few episodes there is maybe 2 or 3 likable characters. The rest could be left to die and the show wouldnt suffer in any way. There is a difference between writing a character that conflicts with others, writing a villain, and putting flaws into a blender and calling it a character. It feels as if the writers got to the first dimension of a character, got scared, and pulled it back to about 0.5 character dimension.
Animation/Look : This is where half of my issues come from. The animation is average at best. The 3D is not integrated well, and the 2D is very saccadic. Because the artists didnt match the colors in some places it can feel like you are watching a nice background painting that had paper cutouts of characters put over top with no blending.
The Good : I know it feels like Im ranting. Its purely from the bad taste left in my mouth. The good portion of this show is the overall plot. The episodes individually may be weak, but the plot as a whole isnt terrible. You could say that since that portion is form the Manga that maybe the manga would be a better format for this series. I have always been a fan of plots like Lord of the Flies, Battle Royale, Swiss Family Robinson. Modern people deserted on an island with no information, what do they do.
Overall, I would hard pass this show. If I heard someone mentioning they were going to start it I would probably let them know the same. Its a failed attempt at a good idea.