Updated enemies. Added boost.

AlientAttack.MonoGame/Things/Stars/Star.cs

@@ -0,0 +1,13 @@
+using Microsoft.Xna.Framework;
+
+namespace AlienAttack.MonoGame.Things.Stars;
+
+internal struct Star
+{
+    public Vector2 Pos;
+    public float Size;
+    public float Alpha;
+
+    public float TwinkleSpeed;
+    public float TwinkleT;
+}