This short is very abstract.
A girl gets impaled by a tree. Lots of blood. Later you see Stainboy drag the corpse and her eyes are nearly out of her sockets.
There is a chemical boy who eats anything. He is in pain greatly and dies. Later a cat eats a little of this head(no blood) Then the cat dies.
The bowling ball head could be disturbing to some kids. When the bowling ball hits the garbage there is blood and a corpse there(pretty graphic for a cartoon)
The robot thing is a little scary but no blood.
Matchstick is a little creepy. She gets blown up at the end. No blood.
The last episode is the creepiest. You see stainboys mom give birth (no blood) and his past is very weird and bloody.