In general, if you're supposed to feel bad for one of the bodies you've cleaned up it's typically a woman. There's a cutscene where a woman is heard begging for her life before she's killed.
A hacker gains access to speakers and appliances in a "smart house" to make the residents think that it's haunted. Instead, a resident questions their sanity, unsuccessfully goes on antipsychotics, and eventually snaps.
There are frequently large amounts of empty alcohol bottle, and the aftermath of a raging party with bottles and what seems to be vomit, with recordings of very drunk people.
Cats come up at crime scenes, and generally there's an implication that they're just out of sight of the player at the murder scene, or that they escaped through a window before you arrived. None of them seem to have been hurt.
The post-game Communiti mission Alter Ego has some stuff involving human cloning, including strange malformed internal organs that must be disposed of.
To clarify, nobody dies on screen. There are however many dead bodies in game, and you can piece together what happened to them through the environment. But you don't see anybody be killed or harmed in real time.
There's an eerie crimescene where some objects unexpectedly fall and the character expresses surprise, but it doesn't really constitute a jumpscare. The game can get tense but never takes advantage of that with loud or sudden scares
Several of the "Nightmare" levels directly allude to paranormal occurrences - specifically the nightmare version of the level "Toxic Love" features several ghosts that are shown getting revenge on the one who killed them.
The Haunted level in particular has some eerie mannequin heads, one with glowing eyes. They can move places when the player isn't looking. In the "Modern Art" level, there's a secret room where you find a katana. Upon picking it up, you're directed to defeat the surrounding "enemies" while loud music blares. The enemies are series of stationary mannequins with glowing eyes that are reaching through mirrors; could definitely be startling to someone with a phobia. To avoid the latter mannequins, don't complete the TV puzzle.
Not throughout the main campaign, however the "Nightmare" versions of the missions, being dream sequences, aren't as grounded as the rest of the game. These feature dream catchers which show you visions of the past when interacted with, as well as some features of the levels suddenly changing when you leave a room and come back, as well as other bizarre dreamlike occurrences that vary from level to level.
The level "Toxic Love" revolves around the killing of a man involved in human trafficking - a notebook can be found in a secret room referring to women with sexually objectifying language.
The protagonist's daughter has some form of unnamed, presumably terminal illness, which she is receiving treatment for at a hospital. The game is about collecting funds for her treatment.
Generally, the ending is the best you could hope for in the situation the protagonist has gotten himself into, but it's also quite ambiguous. Generally, he nor his family is harmed, and he seems to get away mostly scott-free.
Most of the gameplay is cleaning blood and disposing of bodies. Their wounds aren't really rendered in gruesome detail, but if you look closely you can see cuts and blood stains where their fatal wounds were dealt. Blood can be reduced somewhat in the settings.
A body can be found at the bottom of a pool in the level "Affair With Death", though it's implied they were shot and fell/were thrown in afterwards rather than having drowned.