Incomprehensive auto death on 2D runner with energy depleting mechanics [Debugging]

Hello I am new on unity and had been mixing tutorial here and there in order to make my second game (pushing my boundaries). And mixed the Infinite Runner for the tutorials of Unity, and a YouTube Video for Health Bars. And ended looking like this:

Also created pickup objects (Batteries) to increase its current health (Energy) as i'm reducing it with deltaTime, and when its current health is minor than zero it chances Scenes to a result page with its final score and a button and returns him to the game Scene. Visually works just fine, but the mechanics are wrong.

Even though the health bar has energy because of the pickups have increased it, the game passes to the result scene as if I haven't picked any. I found that the moment in which the game suddenly change of scenes has to do with the rate in which I decreased the current health of my character.

This is my current script (its fused with the Player model):

 using UnityEngine;
 using System.Collections;
 using UnityEngine.UI;
 
 public class HealthBarScript : MonoBehaviour {
 
     float currentHealth;
     float  MaxHealth =100;
     float  MinHealth =0;
     Image healthBar;
     Color NewColor;
     HealthBarScript DoIt;
     Text textHealth;
 
     void Start ()
     {
         healthBar = GameObject.FindGameObjectWithTag("HealthBar").GetComponent<Image>();
         textHealth = GameObject.FindGameObjectWithTag ("TextHealth").GetComponent<Text> ();
         currentHealth = MaxHealth;    
     }
 
     // Update is called once per frame
     void Update () 
     {
         if (currentHealth > 100) 
             currentHealth = MaxHealth;
 
         healthBar.fillAmount = MapValues (currentHealth, 0, 100, 0, 1);
         textHealth.text = "Energy: " + currentHealth;
         
         //change colors
         if (currentHealth > 50) //mora than 50% health 
         {  
             NewColor = new Color32 ((byte)MapValues (currentHealth, MaxHealth/2, MaxHealth, 255, 0), 255, 0, 255);
             healthBar.color = NewColor; 
         } 
         else  //Less than 50%
         {
             NewColor = new Color32 (255, (byte)MapValues(currentHealth, MinHealth, MaxHealth/2, 0, 255), 0, 255);
             healthBar.color = NewColor;
         }
 
 
 
         //die withouth health
         if (currentHealth < MinHealth) {
             Application.LoadLevel (1);
         }
 
 
         if (Input.GetKeyDown (KeyCode.P))
             Heal ();
 
     }
 
     void LateUpdate()
     {
         Dmg ();
     }
 
     void Dmg()
     {
         currentHealth += -10f*Time.deltaTime;
     }
 
     void Heal()
     {
         currentHealth +=20f;
     }
 
     void OnTriggerEnter2D(Collider2D other)
     {
         if (other.tag == "Heal") {
             Heal();
             Destroy(other.gameObject);
         }
     }
         
 
     private float MapValues(float x, float inMin, float inMax, float outMin, float outMax)
     {
         return (x-inMin) * (outMax - outMin) / (inMax - inMin) + outMin;
     }
 }
 

As it is the game would have stopped when the Score is 1003 or 10s. Because the game Score is also increased with Time.deltaTime*100. As a test I included that if 'P' is pressed would get Heal() and I could extend the Game play time with it.

Now I am even more confused. I don't know if its my script, or some mechanic of unity which I am not aware of. I will include a link for a copy of the project at my dropbox, I hope you can help me.