public static void Update(int Stage)
        {
            switch (Stage)
            {
            case 1:
                if (!PlayerShip.Instance.IsDead && EntityManager.enemies.Count < 20)
                {
                    if (inverseSpawnChance > 15)
                    {
                        inverseSpawnChance -= 0.005f;
                    }
                    if (rand.Next((int)inverseSpawnChance) == 0)
                    {
                        EntityManager.Add(Enemy.CreateBasic(GetSpawnPosition(), Stage));
                    }

                    if (rand.Next((int)inverseSpawnChance) == 0)
                    {
                        EntityManager.Add(Enemy.CreateAsteroid(GetSpawnPosition(), Stage));
                    }

                    if (rand.Next((int)inverseSpawnChance) == 0)
                    {
                        EntityManager.Add(Enemy.CreateTwinShotEnemy(GetSpawnPosition(), Stage));
                    }
                }
                break;

            case 2:
                if (inverseSpawnChance > 10)
                {
                    inverseSpawnChance -= 0.05f;
                }
                if (!PlayerShip.Instance.IsDead && EntityManager.enemies.Count < 20)
                {
                    if (inverseSpawnChance > 20)
                    {
                        inverseSpawnChance -= 0.005f;
                    }
                    if (rand.Next((int)inverseSpawnChance) == 0)
                    {
                        EntityManager.Add(Enemy.CreateBasic(GetSpawnPosition(), Stage));
                    }

                    if (rand.Next((int)inverseSpawnChance) == 0)
                    {
                        EntityManager.Add(Enemy.CreateAsteroid(GetSpawnPosition(), Stage));
                    }

                    if (rand.Next((int)inverseSpawnChance) == 0)
                    {
                        EntityManager.Add(Enemy.CreateTwinShotEnemy(GetSpawnPosition(), Stage));
                    }

                    if (rand.Next((int)inverseSpawnChance) == 0)
                    {
                        EntityManager.Add(Enemy.CreateMissleEnemy(GetSpawnPosition(), Stage));
                    }
                }
                break;

            case 3:
                if (!PlayerShip.Instance.IsDead)
                {
                    if (BossSpawned == false)
                    {
                        EntityManager.Add(Boss.CreateBoss(new Vector2(GameRoot.ScreenSize.X / 2, GameRoot.ScreenSize.Y / 2)));
                        BossSpawned = true;
                    }
                }
                break;
            }
        }