Added basic settings menu ... settings not really relevant right now but the fullscreen/windowed seems to be doing something so presumably it works?

evolve-die-repeat/main_menu.tscn

@@ -10,6 +10,10 @@ func _on_play_button_pressed() -> void:
 	print(\"Starting game by pressing button...\")
 	GameManager.start_game()
 	self.queue_free()
+
+
+func _on_settings_wheel_button_pressed() -> void:
+	$Settings.visible = not $Settings.visible
 "
 
 [sub_resource type="LabelSettings" id="LabelSettings_rhts7"]
@@ -54,8 +58,9 @@ horizontal_alignment = 1
 vertical_alignment = 1
 
 [node name="Settings" parent="." unique_id=112964493 node_paths=PackedStringArray("MenuPanelRef") instance=ExtResource("1_06t4h")]
+visible = false
 layout_mode = 1
-MenuPanelRef = NodePath("../SettingsWheelButton")
+MenuPanelRef = NodePath("..")
 
 [node name="SettingsWheelButton" type="Button" parent="." unique_id=2147291321]
 layout_mode = 0
@@ -63,3 +68,5 @@ offset_left = 898.0
 offset_top = 46.0
 offset_right = 954.0
 offset_bottom = 93.0
+
+[connection signal="pressed" from="SettingsWheelButton" to="." method="_on_settings_wheel_button_pressed"]