[devilsknite1]

That's possible, but it wouldn't be able to [easily] kill the GUI and would have to be put in every single level, considering the player could potentially reach any level after having the class' GUI activated in the level it stands in.
The class creates a button on the screen, so it's not like it can simply be closed out of, and like I stated previously, if onPlayerEnters() were to be used, it would have to be placed in every level and would make it far more difficult to destroy the GUI after the player leaves said level.