The main protagonist repeats multiple times that his son has died around a year ago, no explicit death is shown on screen though aside from the son's grave and a cutscene of a nightmare about the son burning up in the sun, which is drawn in a child-like scribbly art style
In one of the extremely short cutscenes near the beginning of the game, theres an audio + visual jumpscare, in Oliver's bar, there is a minor audio + visual jumpscare that can occur if you select a certain option when talking to the green character
One of the characters takes advantage of the main protagonist's OCD and uses it to cause the protag distress and mocks him for it, the character does apologize near the end of the game
The main character's son died offscreen for unrevealed reasons prior to the beginning of the story, and considering all the characters are anthropomorphic animals, yes a non-human character dies.
One of the characters constantly describes the main protagonist as a horrible father to purposely upset him. At the end of the game, the supposed kidnapper repetitively asks if the main protag is trying to make them upset for not responding to them.
Although the main antagonist does not have a named mental illness, it is quite obvious that they suffer from some sort of mental health condition. Said antagonist is also violent towards the main protagonist.
After one of the characters bullies the main protagonist, they take advantage of the protag's OCD and cause him to become extremely distressed, the anxiety attack is not explicitly described or shown
It's only a few seconds, but the main protagonist has a short shower only depicted as a black screen with water rushing noises, then is shown in a mirror, covered in a towel
In the opening sequence of chapter one, the main protagonist is tied to the wall by the antagonist, the action of the kidnapping is not shown on screen
There is a minor side character who lives in a trashcan. This character also tells the main character about how another character was homeless for a short while due to his transphobic parents.