Adding mute button.

Assets/Scenes/SampleScene.unity

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+  m_text: Press R to Retry, N to switch mission and M to mute music
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+  music: {fileID: 508468660}
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Assets/Script/InventoryManager.cs

@@ -13,6 +13,7 @@ public class InventoryManager : MonoBehaviour
     public Tilemap selectorMap;
     public TileBase[] selector;
     public TextMeshProUGUI turnCount;
+    public AudioSource music;
 
     [Space]
     public GameObject[] slots;
@@ -80,6 +81,10 @@ public class InventoryManager : MonoBehaviour
             GetComponent<Pokedex>().UpdateMissionText();
             turnCount.text = "Turn: 01";
         }
+        if (Input.GetKeyDown(KeyCode.M))
+        {
+            music.mute = !music.mute;
+        }
     }
 
     private bool CanPlantAt(Vector3 position, TreeItem item)
@@ -153,6 +158,7 @@ public class InventoryManager : MonoBehaviour
     public void PlaceRandomTrees(int number)
     {
         TreeItem[] trees = items.Where(x => x.type != TreeType.Nothing).ToArray();
+        preSpawnedTree = new Dictionary<int, TreeType>();
         for (int i = 0; i < number; i++)
         {
             TreeItem tree = trees[Random.Range(0, trees.Length)];