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.
Foe Yay: Onibi really likes Hibana. All the cutscenes with him involve him putting the moves on her. It's one-sided, as after Hibana kills Onibi, she says 'Damn... now I just feel dirty.'
Fridge Logic: You are in a quest to, among other things, collect the various pieces of the cursed sword Akujiki. The first cutscene with Onibi in level 5 shows that the purple containers that recharge your special attack ingame actually contain about 3-inch-long shards of the cursed sword. You collect somewhere around a dozen. Per level. Just how Goddamn big is it?
That One Level: Golden Palace. Hibana can double-jump and air-dash once each before needing to land, unless she manages to kill an enemy in mid-air. Golden Palace is the first level where this is required to navigate across a bottomless pit, which demands quick reflexes and pinpoint accuracy. This ends up presenting the game's primary Scrappy Mechanic: "Tate pits" will likely be the players' main source of game overs, as tate chains have a tendency to randomly end halfway through the run of enemies.