Make stuff not public if it doesn't need to be

Assets/Scripts/CustomGamePlayer.cs

@@ -18,23 +18,22 @@ public class CustomGamePlayer : MonoBehaviour
     private float antiLeft;
     private float screenWidth;
     internal bool isGrounded;
-    public TMP_Text scoreText;
-    public TMP_Text boostText;
-    public GameObject bird;
-    public GameObject pausePanel;
-    public Rigidbody2D rb;
+    [SerializeField] private TMP_Text scoreText;
+    [SerializeField] private TMP_Text boostText;
+    [SerializeField] private GameObject bird;
+    [SerializeField] private GameObject pausePanel;
+    [SerializeField] private Rigidbody2D rb;
     public AudioSource backgroundMusic;
-    private float nextUpdate;
-    public SpriteRenderer overlayRender;
+    [SerializeField] private SpriteRenderer overlayRender;
     private float lastMoveTime;
-    public GameObject berryParent;
+    [SerializeField] private GameObject berryParent;
 
-    public GameObject mobileButtons;
-    public Button pauseButton;
-    public Button restartButton;
-    public Button jumpButton;
-    public Button rightButton;
-    public Button leftButton;
+    [SerializeField] private GameObject mobileButtons;
+    [SerializeField] private Button pauseButton;
+    [SerializeField] private Button restartButton;
+    [SerializeField] private Button jumpButton;
+    [SerializeField] private Button rightButton;
+    [SerializeField] private Button leftButton;
 
     private float normalBerryChance;
     private float poisonBerryChance;