Whaa, EN broke free D:
To be honest, quite in character, but I don't know how that would happen O_O they all use the same audio source, just with different pitches.
Also can you elaborate at failing the game? If you wanted to ask if there was a failstate, there technically isn't one, except for softlocks. (I wanted to make a reset button, but didn't have the time.) Endless mode is endless, unless softlocked (it should be pretty unlikely to happen on accident), it ends when you decide to stop playing ^_^