Minor fixes

Scenes/Levels/Level9.tscn

@@ -44,6 +44,7 @@ _healthBar = NodePath("")
 
 [node name="FinalBossGUI" type="Control" parent="." groups=["BossGUI"]]
 visible = false
+z_index = -1
 layout_mode = 3
 anchors_preset = 15
 anchor_right = 1.0
@@ -52,6 +53,7 @@ grow_horizontal = 2
 grow_vertical = 2
 
 [node name="TextureProgressBar" type="TextureProgressBar" parent="FinalBossGUI"]
+z_index = -1
 layout_mode = 1
 anchors_preset = 10
 anchor_right = 1.0
@@ -67,6 +69,7 @@ texture_progress = ExtResource("5_jjg8p")
 script = ExtResource("2_53ar2")
 
 [node name="Label" type="Label" parent="FinalBossGUI"]
+z_index = -1
 layout_mode = 1
 anchors_preset = 5
 anchor_left = 0.5