Before I continue, I have to share the premise of the made-up title (Devil Cop) mentioned in the header: "Play as a half-man, half-demon who uses his satanic powers for good by tracking down evildoers in the city, foiling their criminal plots and arresting them."
Anyway, that's not the point of this post. What is the point? To get you to check out K. Nelson's gnarly Made Up Video Game site. Each week, the site shines the spotlight on a piece of cover art--created by Nelson--that's based on a game idea (actually, a title and description) submitted by a reader.
Although all of Nelson's creations are well worth your attention, I suggest you begin by checking out Andrew Lloyd Webber's Castlevania: Symphony of the Night: THE GAME, H.P. Lovecraft's Zany Mini Golf and Spelling Champion: Earn My Love.