I would like to create a script that targets a 2d sprite "enemy" and changes their color to red (slightly opaque red if possible) when you hit tab.

I have this code from a 3d tutorial hoping the transition would work. But it does not. I only get the script to cycle the enemy tags but never changes the color of the sprite. I have the code below

I'm very new to coding, and any help would be FANTASTIC! HELP! hahah.

TL;DR Cant get 3d color targeting to work for 2D. Check out the c#code below

using UnityEngine;
using System.Collections;
using System.Collections.Generic;

public class Targetting : MonoBehaviour {
    public List targets;
    public Transform selectedTarget;
    private Transform myTransform;

    // Use this for initialization
    void Start () {
        targets = new List();
        selectedTarget = null;
        myTransform = transform;
        AddAllEnemies();
    }

    public void AddAllEnemies()
    {
        GameObject[] go = GameObject.FindGameObjectsWithTag("Enemy");
        foreach(GameObject enemy in go)
            AddTarget(enemy.transform);
    }

    public void AddTarget(Transform enemy)
    {
        targets.Add(enemy);
    }

    private void SortTargetsByDistance()
    {
        targets.Sort(delegate(Transform t1,Transform t2) {
        return Vector3.Distance(t1.position, myTransform.position).CompareTo(Vector3.Distance(t2.position, myTransform.position));
        });
    }

    private void TargetEnemy()
    {
        if(selectedTarget == null)
        {
            SortTargetsByDistance();
            selectedTarget = targets[0];
        }
        else
        {
            int index = targets.IndexOf(selectedTarget);
            if(index < targets.Count -1)
            {
                index++;
            }
            else
            {
                index = 0;
            }
            selectedTarget = targets[index];
        }
    }

    private void SelectTarget()
    {
        selectedTarget.GetComponent().color = Color.red;
    }

    private void DeselectTarget()
    {
        selectedTarget.GetComponent().color = Color.blue;
        selectedTarget = null;
    }

    // Update is called once per frame
    void Update()
    {
        if(Input.GetKeyDown(KeyCode.Tab))
        {
            TargetEnemy();
        }
    }
}