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.
YMMV: Vacant Sky
Anticlimax Boss: It is quite possible to kill Ejaro, nominally the final boss of the contention ending, in one hit (provided you buff yourself and it is a critical). Of course, the real "final boss battle" was Vastale a few minutes earlier.
Breather Level: After the extremely combat-heavy level 2 of the final dungeon, the third level contains absolutely no combat or puzzles. And in the Relinquish ending it leads right into the completely-empty final area and a bossless finale.
The soundtrack, which was all composed for the game, can be listened to and bought here.
Auria's theme Lie Your Way, which is the ending theme of the first act, Vagrant II, the second boss theme of Weapon, When I Die, the main theme of act two and A Story Alone, the ending theme of the third act and the whole game.
What Do You Mean, It's Not Symbolic?: The level names/subtitles in the final dungeon: Attachment to Life, Attraction to Death (with Trials of Isolation, Anger, Bargaining, Depression and Acceptance), Eternal Punishment and Contention Core. This does an excellent job of masking the true meaning of the seals in Eternal Punishment until it's far too late.