The mod is really well designed, I only have a few small suggestions:
- please also add an icon for the shortcut bar
- add option to hide the top left button
- make the window close with e and escape key

Adding a shortcut is a great idea, I will have to research how to do this.

Closing the GUI with 'e' and escape make sense. I also wonder if it should close automatically when another GUI is opened, like for Inventory or clicking on a chest/launchpad.

Is the mod-gui-button that annoying? I don't remember seeing it optional on other mods.

Closing the GUI automatically would be also a nice addition.

I think an option to hide the mod-gui-button icon makes sense, especially if you introduce a shortcut icon. I feel in general that the shortcut bar is more unobtrusive and flexible. It gives the player a choice whether to display the icon and in which order.

I don't remember seeing it optional on other mods.

It's optional in SE ;)

-- Mostra la ventana
local Screen = Player.gui.screen
WindowFrame = Screen.add( WindowFrame ) -- Mostrar la ventana
WindowFrame.auto_center = true
Player.opened = WindowFrame -- Indicar que la ventana esta abierta, y se cierre al abrir otra interfaz, presionar E o Esc

Thanks for the suggestions and the tip. I got the "close window" behaviors to work as expected now.

Haven't looked at the Mod Button setting option yet.

Mod button setting implemented in 1.1.3.