added speed change and death

Assets/Code/Gameplay/Player/PlayerController.cs

@@ -5,14 +5,18 @@ namespace Code.Gameplay.Player
     public class PlayerController : MonoBehaviour
     {
         [SerializeField] private float forwardSpeed = 10f;
+        [SerializeField] private float maxSpeed = 40f;
         [SerializeField] private float laneDistance = 5f;
-        [SerializeField] private float jumpForce = 8f;
+        [SerializeField] private float jumpForce = 11f;
         [SerializeField] private float gravity = 20f;
 
         private int _targetLane = 1;
 
         private CharacterController _controller;
         private Vector3 _direction;
+        
+        public System.Action OnPlayerDeath;
+        private bool _isDead = false;
 
         private void Start()
         {
@@ -21,6 +25,8 @@ namespace Code.Gameplay.Player
 
         private void Update()
         {
+            if (_isDead) return;
+
             if (UnityEngine.Input.GetKeyDown(KeyCode.RightArrow) || UnityEngine.Input.GetKeyDown(KeyCode.D))
             {
                 _targetLane = Mathf.Min(_targetLane + 1, 2);
@@ -66,11 +72,16 @@ namespace Code.Gameplay.Player
             var finalMove = new Vector3(moveX, _direction.y * Time.deltaTime, _direction.z * Time.deltaTime);
 
             _controller.Move(finalMove);
+            CheckForDeath();
         }
 
         public void IncreaseSpeed(float amount)
         {
-            forwardSpeed += amount;
+            if (forwardSpeed < maxSpeed)
+            {
+                var desirableSpeed = forwardSpeed + amount;
+                forwardSpeed = Mathf.Min(desirableSpeed, maxSpeed);
+            }
         }
         
         private void OnTriggerEnter(Collider foreign)
@@ -82,5 +93,23 @@ namespace Code.Gameplay.Player
                 Destroy(foreign.gameObject);
             }
         }
+        
+        private void CheckForDeath()
+        {
+            if (_isDead) return;
+
+            if (Time.timeSinceLevelLoad > 1f && _controller.velocity.z <= 0.1f)
+            {
+                Die();
+            }
+        }
+        
+        private void Die()
+        {
+            _isDead = true;
+            forwardSpeed = 0;
+            _direction = Vector3.zero;
+            OnPlayerDeath?.Invoke();
+        }
     }
 }