Add project files.

AlientAttack.MonoGame/Things/Explosion.cs

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+using Microsoft.Xna.Framework;
+using Microsoft.Xna.Framework.Graphics;
+
+namespace AlienAttack.MonoGame.Things;
+
+internal class Explosion(int x, int y, float xVel, float yVel) : Sprite(x, y)
+{
+    protected int CurrentFrame { get; private set; } = 1;
+    protected int MaxFrames => 9;
+    protected int AnimationThreshold => 3; //5;
+    protected int CurrentThreshold { get; private set; } = 5;
+
+    public override void Draw(SpriteDrawArgs args)
+    {
+        Texture2D texture = args.Content.Load<Texture2D>(@$"Sprites\Explosion01_Frame_0{CurrentFrame}_png_processed");
+        args.SpriteBatch.Draw(texture, Position, null, DrawColor, 0, new Vector2(0, 0), 1f, SpriteEffects.None, 1);
+
+        base.Draw(args);
+    }
+
+    public override void Update(SpriteUpdateContext context)
+    {
+        base.Update(context);
+
+        XPosition += xVel;
+        YPosition += yVel;
+
+        if (CurrentThreshold > 0)
+        {
+            CurrentThreshold--;
+        }
+        else
+        {
+            if (CurrentFrame == MaxFrames)
+            {
+                IsDead = true;
+                return;
+            }
+
+            CurrentFrame++;
+            CurrentThreshold = AnimationThreshold;
+        }
+    }
+}