I think bullets come out now.

[rbdr/super-polarity] / Super Polarity / ParticleEffectFactory.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;

namespace SuperPolarity
{
    static class ParticleEffectFactory
    {
        static Game Game;
        static Random random;

        static ParticleEffectFactory()
        {
            random = new Random();
        }

        public static ParticleEngine CreatePolarCircle(Vector2 location)
        {
            List<Texture2D> texturesList = new List<Texture2D>();

            //texturesList.Add(Game.Content.Load<Texture2D>("Graphics\\circle"));
            texturesList.Add(Game.Content.Load<Texture2D>("Graphics\\diamond"));
            texturesList.Add(Game.Content.Load<Texture2D>("Graphics\\square"));

            ParticleEngine particleEngine = new ParticleEngine(texturesList, location);

            particleEngine.Color = new Color(239, 203, 204);
            particleEngine.TTL = 10;
            particleEngine.TTLRandomFactor = 5;
            particleEngine.ScatterFactor = 40;
            particleEngine.ParticleCount = 50;
            particleEngine.StretchFactor = 2.8f;


            return particleEngine;
        }

        public static ParticleEngine CreateBullet(Vector2 location)
        {
            List<Texture2D> texturesList = new List<Texture2D>();

            texturesList.Add(Game.Content.Load<Texture2D>("Graphics\\circle"));
            //texturesList.Add(Game.Content.Load<Texture2D>("Graphics\\diamond"));
            texturesList.Add(Game.Content.Load<Texture2D>("Graphics\\square"));

            ParticleEngine particleEngine = new ParticleEngine(texturesList, location);

            particleEngine.Color = Color.Gray;
            particleEngine.TTL = 5;
            particleEngine.TTLRandomFactor = 5;
            particleEngine.ScatterFactor = 5;
            particleEngine.ParticleCount = 10;
            particleEngine.StretchFactor = 1;

            return particleEngine;
        }

        internal static void SetGame(Game game)
        {
            ParticleEffectFactory.Game = game;
        }
    }
}