Update Project

Assets/Scripts/Core/DeathHandler.cs

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+using UnityEngine;
+using Zenject;
+using FlappyBird.Gameplay.Pipes;
+namespace FlappyBird.Core
+{
+    /// <summary>
+    /// Pure C# service — owns all death side-effects.
+    /// Subscribes to IGameStateManager.OnStateChanged at construction time
+    /// and reacts when the state becomes GameOver.
+    ///
+    /// Side-effects on death:
+    ///   1. Freeze the bird Rigidbody2D (velocity + gravity)
+    ///   2. Reset the pipe spawner timer so pipes start cleanly on restart
+    /// </summary>
+    public sealed class DeathHandler : IDeathHandler, IInitializable
+    {
+        private readonly Rigidbody2D       _birdRigidbody;
+        private readonly IGameStateManager _gameStateManager;
+        private readonly IPipeSpawner      _pipeSpawner;
+        public DeathHandler(
+            Rigidbody2D       birdRigidbody,
+            IGameStateManager gameStateManager,
+            IPipeSpawner      pipeSpawner)
+        {
+            _birdRigidbody    = birdRigidbody;
+            _gameStateManager = gameStateManager;
+            _pipeSpawner      = pipeSpawner;
+        }
+        // ── IInitializable ─────────────────────────────────────────────────
+        public void Initialize()
+        {
+            _gameStateManager.OnStateChanged += OnStateChanged;
+        }
+        // ── IDeathHandler ──────────────────────────────────────────────────
+        /// <inheritdoc/>
+        public void HandleDeath()
+        {
+            FreezeBird();
+            _pipeSpawner.ResetTimer();
+        }
+        // ── Private helpers ────────────────────────────────────────────────
+        private void OnStateChanged(GameState newState)
+        {
+            if (newState == GameState.Playing)
+                UnfreezeBird();
+        }
+        /// <summary>
+        /// Kills velocity and disables gravity so the bird hangs in place
+        /// during the GameOver freeze (Time.timeScale is 0, but we set this
+        /// explicitly so the bird does not drop when timeScale resumes on restart).
+        /// </summary>
+        private void FreezeBird()
+        {
+            _birdRigidbody.linearVelocity = Vector2.zero;
+            _birdRigidbody.angularVelocity = 0f;
+            _birdRigidbody.gravityScale = 0f;
+        }
+        /// <summary>Restore gravity when a new game begins.</summary>
+        private void UnfreezeBird()
+        {
+            _birdRigidbody.gravityScale = 1f;
+        }
+    }
+}