Death Counter dont work when changing scenes

Set the count variable to static to keep it consistent across all scenes. i.e.

     public static int deathCount;

The value will never be reset unless you reset it manually or you restart the exe.

Use PlayerPrefs, when you die use this:

      PlayerPrefs.SetInt ("deathCount", PlayerPrefs.GetInt("deathCount") + 1);

and when changing scene call:

      PlayerPrefs.GetInt("deathCount");