Aftershock by Megademo

It’s 1987. A catastrophic seismic event levels half of the Great Plains. The government blames tectonic instability. But when a black-ops recon team led by haunted war vet Major Cole Ramsey arrives to secure a mysterious impact zone, they uncover something far worse: a dormant alien device, awakened after centuries underground, now rewriting Earth’s biosphere.

As the device spreads a mutagenic shockwave, twisting humans and animals into alien hybrids, Ramsey’s team must fight through collapsing cities, hostile terrain, and the infected remains of civilization. But time is running out. The next pulse will finish the job—and Earth will never be the same.

"Kopfkino" - German for vividly imagining a scenario or playing out events in your head, almost like watching a movie in your mind.