Aliens make monsters

Aliens make monsters on earth and the main thing is parasites and they are going to kill everything on earth even the aliens. The aliens are causing the extinction of everything on earth you only have a few days to get prepared and fight back start a village and get people back to fighting the parasites. The aliens make other monsters such as mutant zombies, frostmaw, naga, grue and many more. fight back with guns and flee with cars and planes.