Did the creature intend to kill the child? How did he react once he had killed the child?

Certainly not at first. He was hoping the child was not yet tainted by the same hatred as adults. He seizes the boy's arm as he runs past; the child screams in terror and struggles to get away. He calls the creature a "hideous monster," and says that his father, M. Frankenstein, will punish him. Upon hearing the name of Frankenstein, the creature, enraged, strangles him. He feels a "hellish triumph" at the boy's death, and reflects that his despised creator is not, after all, invulnerable.