These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Hard Levels, Easy Bosses: The levels are famous for their frustrating difficulty, but the bosses are basically gigantic hitboxes that shoot very slow, large projectiles at you.
Most Annoying Sound: The music that plays during levels (all of them) is an extremely repetitive track that loops every 15 seconds. Also, the iconic "Dun dah-nuh nuh-nuh" that plays when a level begins will grate on you after dying for the hundreth time.