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.
That One Level: The Lost Caves really feel like someone accidentally put one of the very last stages right at the start of the game. Very long compared to the stages before it, full of Invincible Minor Mooks, and no health pickups whatsoever.