Decreased movement and shot delay of enemies based on number of enemies

remaining; increased tween speed of enemy bounce at 25% remaining.

player.gd

@@ -37,6 +37,7 @@ func start():
     print(shield)
     shader_active = false
     $Ship.frame = 1
+    $Ship/Boosters/BoosterBurst.hide()
     $Ship/Boosters.hide()
     $Ship.show()
     position = Vector2(screensize.x / 2, screensize.y)
@@ -123,9 +124,11 @@ func _on_damage_taken():
 
 func _on_player_victory() -> void:
   print("Victory!")
+  # get_node("EnemyBullet").monitoring = false #TODO make sure bullets stop monitoring!
   set_process(false)
   $Ship.frame = 1
   await get_tree().create_timer(1).timeout
+  $Ship/Boosters/BoosterBurst.show()
   var tween = create_tween()
   tween.tween_property(self, "position:y",  60 * -1, .25).set_ease(tween.EASE_IN)
   await tween.finished