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.
Crowning Music of Awesome - More like a Crowning Soundtrack of Awesome. Take the Credits, for example. (Don't worry, it won't spoil anything but your senses...)
And for Crowning Remix of Awesome, I give you "Kick My Axe".
I dare to say all musics of this game is awesome.
Demonic Spiders: The homing missile-shooting ships in the final level. Unlike most energy-based shots which destroy your weapon first, the missiles are physical objects that will kill you regardless of weapon.