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: Justin and Lo have a bit early on. And a lot later on.
Nightmare Fuel: The demons. Also, a firsthand account of Hell's suffering, courtesy of a couple of condemned souls.
Tear Jerker: April and Justin's parting scene, where Justin realizes that Lo is April, and that they can't be together even though they still love each other.
The story of the two condemned souls that appear to Justin. They were so desperate to have a child that they made a Deal with the Devil...only for the child they desperately wanted to come out stillborn. Ouch.