Hi there! You did a great job with that asset pack I really like your style. I've already integrated some parts into a new project of mine and it works flawless so far :)
quick note: it seems you forgot an get_tree().set_pause(false) within the first condition of the _leaflet (Hud.gd) function. I had the problem that everything was frozen after closing the menu (I've just used the hud and menu scene so far).