i watched a few shorts of it and it was kinda good but also bad. Why? so much animal abuse and it could be caused by themselves or by someone else like flippy for example, he has ptsd and whenever he gets that by seeing stuff that reminds him of war, he flips out and kills someone.
but the good thing about it is that the characters and the animation style are cute.
now comes the real answer: kids who are mature to gore or 12+ can watch HTF
there doesn't seem to be anything here