How do I make enemies not come too close to the player?

I am making a top-down shooter and the enemies are just rushing towards me while shooting when they see me. How do I make them stay for example 128 pixels away from me?

You could add a condition to the event that makes them rush towards you..

system compare two values: distance(you.x,you.y,enemy.x,enemy.y) > 128

Maybe you need to have an else event to stop their movement, that all depends on the way you have set things up..

Ok thanks!