Multitouch swipe to kill enemy (2D) (mobile)

Building a fast paced game in which swipes and taps all kill enemies, so multitouch is important. With the help of one @Bunny83 's old posts, I've created an empty gameobject on my world and inserted this:

 using UnityEngine;
 
 public class SwipeHandler : MonoBehaviour
 {
     public float minMovement = 20.0f;
     public bool sendUpMessage = true;
     public bool sendDownMessage = true;
     public bool sendLeftMessage = true;
     public bool sendRightMessage = true;
     public GameObject MessageTarget = null;
 
     private Vector2 StartPos;
     private int SwipeID = -1;
 
     void Update ()
     {
         if (MessageTarget == null)
             MessageTarget = gameObject;
         foreach (var T in Input.touches)
         {
             var P = T.position;
             if (T.phase == TouchPhase.Began && SwipeID == -1)
             {
                 SwipeID = T.fingerId;
                 StartPos = P;
             }
             else if (T.fingerId == SwipeID)
             {
                 var delta = P - StartPos;
                 if (T.phase == TouchPhase.Moved && delta.magnitude > minMovement)
                 {
                     SwipeID = -1;
                     if (Mathf.Abs(delta.x) > Mathf.Abs(delta.y))
                     {
                         if (sendRightMessage && delta.x > 0)
                             MessageTarget.SendMessage("OnSwipeRight", SendMessageOptions.DontRequireReceiver);
                         else if (sendLeftMessage && delta.x < 0)
                             MessageTarget.SendMessage("OnSwipeLeft", SendMessageOptions.DontRequireReceiver);
                     }
                     else
                     {
                         if (sendUpMessage && delta.y > 0)
                             MessageTarget.SendMessage("OnSwipeUp", SendMessageOptions.DontRequireReceiver);
                         else if (sendDownMessage && delta.y < 0)
                             MessageTarget.SendMessage("OnSwipeDown", SendMessageOptions.DontRequireReceiver);
                     }
                 }
                 else if (T.phase == TouchPhase.Canceled || T.phase == TouchPhase.Ended)
                 {
                     SwipeID = -1;
                     MessageTarget.SendMessage("OnTap", SendMessageOptions.DontRequireReceiver);
                 }
             }
         }
     }    
 }

And, pasted on an enemy, this:

 using UnityEngine;
 using System.Collections;
 
 public class specterScript : MonoBehaviour
 {
 
 
     void OnSwipeLeft()
     {
         Destroy(gameObject);
     }
 }

I receive no errors, but also no results - swiping on the enemy doesn't do anything. Should the swipehandler script not be placed on an empty game object in the hierarchy? Can anyone provide any wisdom? Thanks for your help!