I'd have to give the story a 7 for originality. To begin with, the story is promising and the setting had potential. It left a lot of stuff unexplained though, like why is every single life form a human? Why can wasps speak even though they're so small that there's no room for a brain capable of understanding human language? Why is the praying mantis at the end unable to speak even though wasps can? What's the angel supposed to be? Aren't all the animals supposed to be from reality? So why was there a giant snake thing and that praying mantis-scorpion hybrid? How did that retractable claw thing even work?

I have to admit the ending was rushed. It explained most of the stuff that happened, but felt like a cop out. Were they keeping real live human brains connected to a virtual reality, like in the Matrix, or were the humans simulated in software to begin with? How did they even preserve the minds of the humans, since their brains were probably disintegrated in the impact? Actually how did they get resurrected at all, that was never explained to begin with. The only plausible explanation is that the whole scenario, including the past lives of all the humans, were all completely fabricated. Why would they do that? Not explained. It was implied that they were trying to select a creature design that is most suited for battle. But what about ambush, betrayal, alliances and such? A good design could be caught by surprise by a bad design, or betrayed by a bad design, or attacked by a gang of bad designs. In addition, what if a martial arts expert got given a bad design, and a total idiot got given a good design? I thought that T-Rex design was pretty awesome, but she died because she got killed in human form. Surely that's not a good mechanism for selection? It's too dependent on luck.

As for the art, it was okay. I didn't like the character designs. They were lacking in definition, edges weren't drawn with a line, rather just a gradient was there. The cheeks were also too wide, especially on the kid, and the eyes looked kinda bad. The monster designs and gore was decent though.

Overall if you haven't read this manga then try it to broaden your horizons. It's only 10 chapters. You might find it somewhat interesting.