Добавил отображение таймера

Assets/Scripts/UI/TimerViewer.cs

@@ -0,0 +1,39 @@
+using UnityEngine;
+
+public class TimerViewer : MonoBehaviour
+{
+    [SerializeField] private TurretsBuildTimer _timer;
+    [SerializeField] private GameManager _gameManager;
+    [SerializeField] private TMPro.TextMeshProUGUI _btnText;
+
+    private bool _isFirstTime = true;
+
+    private void OnEnable()
+    {
+        _timer.OnTick += OnTick;
+        _gameManager.OnLevelChanged += OnLevelStart;
+    }
+
+    private void OnDisable()
+    {
+        _timer.OnTick -= OnTick;
+        _gameManager.OnLevelChanged -= OnLevelStart;
+    }
+
+    private void OnTick(TurretsBuildTimer.OnTickEventArgs args)
+    {
+        if (_isFirstTime)
+        {
+            _btnText.text = $"Start ({args.SecondsLeft:0})";
+            return;
+        }
+
+        _btnText.text = $"Next wave ({args.SecondsLeft:0})";
+    }
+
+    private void OnLevelStart(GameManager.OnLevelChangedEventArgs _)
+    {
+        _isFirstTime = false;
+        _btnText.text = "Next wave";
+    }
+}

Assets/Scripts/UI/TimerViewer.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: a8f51f072b7c7e64b8fde0e36109e334