Combat.cs

using UnityEngine;
using System.Collections;
using UnityEngine.UI;

public class Combat : MonoBehaviour {

    //Click References
    public Ray ray;
    public RaycastHit hit;


    //Text Variables
    public static int hpValue;

    Text hpText;

    //Game Objects
    public GameObject enemy1;
    public GameObject enemy2;

    //Combat Variables
    public int damage = 25;
    public int damageEnemy = 25;
    public int xp = 0;

    public int enemy1HP = 75;
    public int enemy2HP = 100;

    //Collectables
    public GameObject healthPickup;
    public GameObject xpCube;
    public GameObject gunPickup;




    //Initiate Game Stuff

    void Awake()
    {
        hpText = GetComponent<Text>();

        hpValue = 100;
    }

    void Update()
    {
        ray = Camera.main.ScreenPointToRay(Input.mousePosition);

        //Combat
        if (Physics.Raycast(ray, out hit))
        {
            if (Input.GetKeyDown(KeyCode.Mouse0))
            {
                if (hit.transform.name == "Enemy1")
                {
                    hpValue = hpValue - damageEnemy;
                    enemy1HP = enemy1HP - damage;
                    Debug.Log("attack registered");
                }

            }
        }
        if(enemy1HP <= 0)
        {
            Destroy(enemy1);
  
        }
        if (Physics.Raycast(ray, out hit))
        {
            if (Input.GetKeyDown(KeyCode.Mouse0))
            {
                if (hit.transform.name == "Enemy2")
                {
                    hpValue = hpValue - damageEnemy;
                    enemy2HP = enemy2HP - damage;
                    Debug.Log("attack registered");
                }

            }
        }
        if (enemy2HP <= 0)
        {
            Destroy(enemy2);

        }
        //Level Up
        if (Physics.Raycast(ray, out hit))
        {
            if (Input.GetKeyDown(KeyCode.Mouse0))
            {
                if (hit.transform.name == "XPCube")
                {
                    Destroy(xpCube);
                    xp = 1;                }

            }
        }

        if(xp > 0)
        {
            damageEnemy = 12;
        }



        //HP Pickup
        if (Physics.Raycast(ray, out hit))
        {
            if (Input.GetKeyDown(KeyCode.Mouse0))
            {
                if (hit.transform.name == "HealthKit")
                {
                    Destroy(healthPickup);
                    hpValue = hpValue + 30;
                }

            }
        }

        //Mega Gun

        if (Physics.Raycast(ray, out hit))
        {
            if (Input.GetKeyDown(KeyCode.Mouse0))
            {
                if (hit.transform.name == "MegaGun")
                {
                    Destroy(gunPickup);
                    damage = 100;
                }

            }
        }
        //HP Display
        hpText.text = "health: " + hpValue;

        //Fail State
        if (hpValue <= 0)
        {
            Application.LoadLevel("CYO_Layout");
        }
    }
}