If your layer is called `game_menu`, renpy.get_screen is interpreted first as a tag and then as a screen, so regardless it wouldn't work with a screen *and* a layer called game_menu. So, I recommend either changing the tag name or the screen name so they're different if you want to use the save-and-restore focus features for the in-game menu screen. Otherwise, it's fine to just not have that screen in the RESTORE_FOCUS_SCREENS.