Review Detail of Eidoriyan in A Demon King's Journey

This novel is my 1st novel so it's gonna be a little slow paced. This novel about a boy who became a demon because of a game. He then adapted to his new body and massacred anyone who opposed him. Expect that the novel will gonna be long as planets and god are common here. In the later parts of the novel, I'm making sure that there will be interstellar wars and celestial wars so be sure to read daily!