I want to give this some credit for the novelty of its idea, but that's really all it has going for it. The effect is a crude imitation of body horror. You can't have it both ways with organ loss: if the biological consequences of losing an organ are stripped away, and what comes out doesn't even resemble a mutilated organ, it may as well not have been an organ to begin with.
The "civilization" part of the anomaly is no less barren than the setup. A scene like the 1997 outbreak could've shown what the anomaly does with a big enough playground, but there's nothing to it. At best, it's a bunch of guys spitting out miniatures and beating each other up. The push for historical geographic context is something but doesn't complement the anomaly's themes especially well and seems cookie-cutter.
I think this idea could've worked for me through either brute force (with a grab bag of hit-or-miss moments) or a small handful of especially clever scenes, but it has neither.