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.
Breather Level: Chapter 5, which is substantially easier than the previous two chapters and has extremely simple chaining. Even the Bosses In Mook Clothing that show up at the end of the pre-boss section that fire massive bullet storms only fire in one color, allowing you to easily build up your homing laser attack to finish them off. Of course, all this is just to give you time to relax before the final two bosses.
Good Bad Bugs: Due to a programming glitch in the Gamecube port, it is possible to trick the game into giving you an extra continue on no continue runs by unplugging your controller from the first slot and plugging it back into the second controller slot on your last life of your continue.
What Do You Mean, It's Not Symbolic?: The chapter titles- Ideal, Trial, Faith, Reality and Metempsychosis- represent Man's struggle towards enlightenment, with the aura-enveloped Ikaruga craft symbolising the human soul. Apparently.