Nightwalkers.io is a zombie survival game set in the modern world. After level 3, you encounter Apocalypses, which means that there will be a bunch of zombies appear to take you away.
HOW TO PLAY NIGHTWALKERS.IO
Nightwalkers are played with the default controls for a top-down shooter.
Use the keys: W, A, D, S to control the moving character
Left click fire while the right mouse button activates melee to knock down zombies and give you breathing space.
B or E keys open the building menu