Add NPC and Power-Up features with associated prefabs and effects

Assets/Scripts/Core/Domain/GameSession.cs

@@ -7,6 +7,8 @@ namespace Core.Domain
     public class GameSession
     {
         private const string HighScoreKey = "HighScore";
+        private const float NpcSpawnTime = 4f;
+        private const float PowerUpSpawnInterval = 25f;
         
         public int Score { get; private set; }
         public int HighScore { get; private set; }
@@ -16,11 +18,16 @@ namespace Core.Domain
         public event Action<string> OnOrbSpawned;
         public event Action OnOrbReset;
         public event Action OnGameOver;
+        public event Action OnSpawnNpc;
+        public event Action<PowerUpType, string> OnSpawnPowerUp;
 
         private readonly List<Tile> _tiles;
         private readonly IPersistenceService _persistenceService;
         private readonly Random _rng = new();
         private int _playerFloorIndex = 0;
+        private float _timeSinceStart;
+        private bool _npcSpawned;
+        private float _powerUpTimer;
 
         public GameSession(List<Tile> tiles, IPersistenceService persistenceService)
         {
@@ -35,9 +42,32 @@ namespace Core.Domain
 
         public void StartGame()
         {
+            _timeSinceStart = 0f;
+            _powerUpTimer = 0f;
+            _npcSpawned = false;
+            
             SpawnNextOrb();
         }
 
+        public void Tick(float deltaTime)
+        {
+            if (IsGameOver) return;
+            
+            _timeSinceStart += deltaTime;
+            if (!_npcSpawned && _timeSinceStart >= NpcSpawnTime)
+            {
+                _npcSpawned = true;
+                OnSpawnNpc?.Invoke();
+            }
+            
+            _powerUpTimer += deltaTime;
+            if (_powerUpTimer >= PowerUpSpawnInterval)
+            {
+                _powerUpTimer = 0f;
+                SpawnRandomPowerUp();
+            }
+        }
+
         public void OrbCollected()
         {
             if (IsGameOver) return;
@@ -95,5 +125,17 @@ namespace Core.Domain
             OnOrbReset?.Invoke();
             SpawnNextOrb();
         }
+
+        private void SpawnRandomPowerUp()
+        {
+            var validTiles = _tiles.FindAll(t => t.CurrentState == TileState.Stable);
+            if (validTiles.Count == 0) return;
+            
+            var tile = validTiles[_rng.Next(validTiles.Count)];
+            
+            var type = _rng.Next(0, 2) == 0 ? PowerUpType.LightFooted : PowerUpType.SpeedBoost;
+            
+            OnSpawnPowerUp?.Invoke(type, tile.Id);
+        }
     }
 }

Assets/Scripts/Core/Domain/PowerUpType.cs

@@ -0,0 +1,8 @@
+namespace Core.Domain
+{
+    public enum PowerUpType
+    {
+        LightFooted,
+        SpeedBoost,
+    }
+}

Assets/Scripts/Core/Domain/PowerUpType.cs.meta

@@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: bafe72a0931b403fbd668163287d60a3
+timeCreated: 1765576209

Assets/Scripts/Core/Domain/Status/Effects/EffectColors.cs

@@ -0,0 +1,10 @@
+using UnityEngine;
+
+namespace Core.Domain.Status.Effects
+{
+    public struct EffectColors
+    {
+        public static readonly Color LightFootedColor = new Color(0.8f, 0.8f, 0.8f);
+        public static readonly Color SpeedBoostColor = new Color(1f, 0.5f, 0f);
+    }
+}

Assets/Scripts/Core/Domain/Status/Effects/EffectColors.cs.meta

@@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: ca5a45bf5f154f009511ace70bfc78aa
+timeCreated: 1765576663

Assets/Scripts/Core/Domain/Status/Effects/SpeedBoostEffect.cs

@@ -0,0 +1,29 @@
+namespace Core.Domain.Status.Effects
+{
+    public class SpeedBoostEffect : IStatusEffect
+    {
+        private float _duration;
+        private readonly float _multiplier;
+
+        public bool IsExpired => _duration <= 0;
+
+        public SpeedBoostEffect(float duration, float multiplier = 1.5f)
+        {
+            _duration = duration;
+            _multiplier = multiplier;
+        }
+
+        public void Tick(float deltaTime)
+        {
+            _duration -= deltaTime;
+        }
+
+        public void ModifyCapabilities(ref PlayerCapabilities caps)
+        {
+            caps.SpeedMultiplier = _multiplier;
+        }
+
+        public void OnApply() { }
+        public void OnRemove() { }
+    }
+}

Assets/Scripts/Core/Domain/Status/Effects/SpeedBoostEffect.cs.meta

@@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: 8fdc1e67835247f6a2afc26cc4ed27a8
+timeCreated: 1765576232