thanks for playing! the red and green dots in the bottom are supposed to represent waves, with the big dot representing a boss fight, green just means that you have completed that wave, but yes i agree that the UI is a bit too busy and at times confusing..
the black ghost, the anger issue itself, is actually the last out of the 4 big bosses in the game, so you were right at the end. when you die i think the damage number have a chance to overlap the restart wave button, which is a bummer, but should hopefully not be too common..
xoxo