Updated asteriods, mines, and explosions.

AlientAttack.MonoGame/Things/Explosions/MineExplosion.cs

@@ -0,0 +1,11 @@
+using Microsoft.Xna.Framework.Graphics;
+
+namespace AlienAttack.MonoGame.Things.Explosions;
+
+public class MineExplosion : Explosion
+{
+    public MineExplosion(int x, int y, float xVel, float yVel) : base(x, y, xVel, yVel)
+    {
+        Scale = new(2, 2);
+    }
+}