You have a good start here but I really think you could do more with this concept. While the "right to the boss" gameplay adds drama and realism to the proceedings (shades of "Shadow of the Colossus"), I feel that more time could have been spent developing the backstory of the demon world. I mean the whole vague, unexplained "travel to another world" theme is so overdone at this point, I feel that you truly could have stood out from the pack if you had developed a richer plot. The ending, however, was darkly satisfying. 4/5