Create Creeper script

Assets/Scripts C#/Ratbots/Creeper.cs

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+using UnityEngine;
+using System.Collections;
+
+public class Creeper : Ratbot
+{
+	float countdown;
+
+	void Update() {
+		if (Vector3.Distance(player.transform.position, transform.position) > 5) {
+			MoveTowardsPlayer(moveSpeed);
+			float newTime = countdown + Time.deltaTime;
+			countdown = (newTime < 1) ? newTime : 1;
+		} else {
+			countdown -= Time.deltaTime;
+			if (countdown < 0) Explode();
+		}
+	}
+	void Explode() {
+		Destroy(gameObject);
+	}
+}

Assets/Scripts C#/Ratbots/Creeper.cs.meta

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+fileFormatVersion: 2
+guid: d23c0105448702c45b209f27f497780f