Added health, respawning and Bullet spawners

Assets/Scripts/Core/GameManager.cs

@@ -1,4 +1,5 @@
 using UnityEngine;
+using UnityEngine.SceneManagement;
 
 public class GameManager : MonoBehaviour
 {
@@ -21,7 +22,7 @@ public class GameManager : MonoBehaviour
     // Start is called before the first frame update
     void Start()
     {
-        
+        player = GameObject.FindGameObjectWithTag("Player").GetComponent<Player>();
     }
 
     // Update is called once per frame
@@ -49,4 +50,11 @@ public class GameManager : MonoBehaviour
     {
         
     }
+
+    public void RestartGame()
+    {
+        //get active scene and reload it 
+        SceneManager.LoadScene(SceneManager.GetActiveScene().name);
+        
+    }
 }