Added win condition for level 1 and added boss fight for level 5

Enemies/Projectiles/Glowing Blue Fireball.gd

@@ -0,0 +1,21 @@
+extends Area2D
+
+const SPEED: int = 60
+
+var velocity: Vector2 = Vector2.ZERO
+
+
+func init(spawn_position: Vector2, shoot_position: Vector2) -> void:
+    position = spawn_position
+    velocity = position.direction_to(shoot_position).normalized() * SPEED
+    return
+
+
+func _physics_process(delta: float) -> void:
+    position += velocity * delta
+    return
+
+
+func _on_lifetime_timeout() -> void:
+    call_deferred('queue_free')
+    return