A quick demo of how to easily beat any boss - in this case, the second Robot boss, Stone Goliath Gaeen, at level 14.
This particular set-up is excellent for bosses. The Kibapon charge forward, keeping the boss distant from the army. The Megapon act as a buffer, with a fairly large amount of HP and an excellent ranged attack that often does ~50-70 damage per note (double from the Divine trumpet).
Meanwhile, the archers are doing three hits each per attack thanks to a sustained Fever, inflicting between 10-30 damage per arrow.
The Kibapon easily dodge most attacks, but I start to get a bit lazy and lose some archers. Whoops! I wasn't too bothered though. The Megapons are slow, but the Kibapons keep the boss so far ahead that they have plenty of time to fall back before they get hit. The only attack this boss hurts with is the Throw, where he lowers his hands to the ground and charges forward, throwing any nearby Patapons away for triple-figure damage.