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.
However, the US soundtrack is a Love It or Hate It- while some love it for the techno, many veterans despise it to the core.
Demonic Spiders: The laser-shooting ships◊ in stages 3 (who reappear again in later levels). Your shield is unable to block their devastating lasers, which will more often than not cost you a life or two.
Love It or Hate It: The US version's soundtrack is either a cool, heart-pumping techno, or a piece of garbage compared to the Japanese version. No exceptions.
Many people who hate it state that the US soundtrack is a complete Soundtrack Dissonance, given the dark nature of the game and graphics.