added speed change and death

Assets/Code/Gameplay/Management/GameSpeedManager.cs

@@ -0,0 +1,33 @@
+using UnityEngine;
+using Code.Gameplay.Player;
+
+namespace Code.Gameplay.Management
+{
+    public class GameSpeedManager : MonoBehaviour
+    {
+        [SerializeField] private PlayerController playerController;
+        [SerializeField] private float speedMultiplier = 1.2f;
+        [SerializeField] private float timeInterval = 10f;
+
+        private float _timer;
+
+        private void Update()
+        {
+            _timer += Time.deltaTime;
+
+            if (_timer >= timeInterval)
+            {
+                AccelerateGame();
+                _timer = 0;
+            }
+        }
+
+        private void AccelerateGame()
+        {
+            if (playerController)
+            {
+                playerController.IncreaseSpeed(speedMultiplier);
+            }
+        }
+    }
+}