Telika: The problem is, gameplay-wise it's not easy to make it a challenge.
LeonardoCornejo: Of course, and that is the funniest part of its inception. Maybe right now we are just talking about it. But someday, someone will make it happen and if it is well done it will be something great.
As Nipoti pointed, it requires a good story. Fun gameplay and good story are the core elements of any good game. Achieve one and the game is decent, achieve both and the game is good, achieve none and the game is a complete waste of money.
You have elements of that in many games. "Vampires The Masquerade" has two games where you play the monster, with enough gameplay and story elements that make it interesting. Games like "Prototype" let you play the monster in an open world. Such games, along with "AvP", let you toy with food as much as you want - you can chase a chosen helpless target around, and play cat and mouse with it as long as you want before swallowing him. Same with the likes of "Carmageddon", "Stubbs", "Elder scroll" (become a vampire or a werewolf), and "Ghost Master", etc (heck,
some might argue that even the Arkham series would qualify). The thing is, you do it for five minutes and then it feels bland. So you have the rest of the game to advance in content until your next slice of aimless sadistic relaxation. Aimless sadistic relaxation which is a fun concept for a moment, but not satisfactory for long : you can find many apps about slapping a politician (or a foreigner), and they do have some download success, but they hardly constitute viable games.
I think that, on the true game front (especially indie, where you have quite a few vampire games exploiting light/shadow puzzles), we are already served the best way we can be...