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Assets/Scripts/LivingEntity.cs

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+using System;
+using UnityEngine;
+
+public class LivingEntity : MonoBehaviour
+{
+    public float health;
+    public void Damage(float amount)
+    {
+        health -= amount;
+        if (health <= 0)
+        {
+            Destroy(gameObject);
+        }
+    }
+    private void OnTriggerEnter2D(Collider2D other)
+    {
+        if (other.gameObject.layer == LayerMask.NameToLayer("Bullet"))
+        {
+            Destroy(gameObject);
+            other.gameObject.SetActive(false);
+        }
+    }
+}