Ghost enemy and other changes

Enemies/Projectiles/Fireball.gd

@@ -0,0 +1,23 @@
+extends Area2D
+
+const SPEED: int = 200
+
+var player_position: Vector2
+var velocity: Vector2 = Vector2.ZERO
+
+
+func init(spawn_position: Vector2, shoot_position: Vector2) -> void:
+    position = spawn_position
+    player_position = shoot_position
+    velocity = position.direction_to(player_position).normalized() * SPEED
+    $Sprite.rotation = player_position.angle_to_point(position) + deg2rad(180)
+    return
+
+
+func _physics_process(delta: float) -> void:
+    position += velocity * delta
+    return
+
+
+func _on_Lifetime_timeout():
+  call_deferred('queue_free')