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.
Demonic Spiders: If Sinistar himself isn't killing you, the Warriors are probably sniping you to death.
Good Bad Bugs: The game had a bug where if you managed to get shot by a Warrior on your last ship just before the player gets killed by Sinistar, in effect killing the player twice, the game would think the player has now 255 ships.
Mondegreen: The crudeness of the speech would make "Run, Coward!" sound like "Ron Howard".
Nightmare Fuel: A giant, flying skull, taunting you in a perfectly intelligible nightmarish voice in an age when few games could talk, that would generally kill you within seconds of appearing on-screen.