*SPOILER* A character pushes another character out of the way of a knife, and it's played like he's dying/dead, but the wound is surface level and the character survives.
Repeated visuals involving the display of moving corpses show up as a representation of guilt and trauma over discovering and hiding the deceaseds' bodies.
The first death is suicide, and the lead up is shown, but not the act itself. There is a musical number about finding the body and the aftermath is shown.
There is a lot of gore in the opening cinematic, animated in a claymation style. It is not excessive, and the live action segments mostly have blood, not gore. However, the director is known for excessive gore and violence, so be warned that themes of that are present and discussed.
A scene involves a character tripping into a freshly-dug hole and being knocked unconscious, wherein both the people digging fight over whether to fill in the hole or not, ultimately choosing to take them back home to recuperate.