itch.io

The issue sees to be that both your command "Ancient Cave Challenge" and "New Game +" have the same command symbol "newgameplus". You cannot have the same command symbol for multiple commands. When I change "Ancient Cave Challenge" command symbol to "newgameplus2" the New Game + option begins working as expected.

Usually this setup error would not close the game window itself, but since both of the commands with the same symbol have "this.popScene()" in their JS Command, it is trying to pop the scene twice - first the Menu Scene and then the Map Scene. This closes the game because there is no scene on the stack below the Map Scene so when the Map Scene is "popped" it exits the game.