The phrase "zombie enemies" refers to people who act like mindless and unthinking enemies, just like zombies. They may not think for themselves and simply follow orders or act maliciously without reason or understanding. Full definition
Also non zombie enemies are still a frustrating distraction more than anything. (metacritic.com)
The pack will contain four lovely arenas for either you or you and a friend in which to do battle with waves of horrifying zombie enemies. (wolfsgamingblog.com)
It's quite fun and pleasing to kill zombie enemies - they literally fall apart as you shoot them. (gamerstemple.com)