If I were to make a game it would be very creative and diverse because I have such an imagination when it comes to things like that. My game would be dark but even at sometimes light as well. It would be Action Adventure Shooter, cause those are my favorites. There would be many different things you wouldn't see in another game, and I would make sure of that.
my would be a assassins creed 2 3rd person with left 4 dead 2 1st person and zombies (you can switch from 3rd person to 1st) with ninja gaiden 2 weapons and moder warfare 2's online multiplayer also you have weapons from all those games
i would make a different kind of garrys mod where i can go in EVERY game i like and do everything i like (like AC with zombies) or a car race in Diablo 2 or crap like that
a game like gta only with tons of areas with diferent enemies like zombies and midevil time to military style. and you could build a baricade or your own home anywhere and you were aload to do ANYTHING from cry to fuck hot girls
it would be a pretty mysterious game called "5" its a story about a demonic army who fights for the power of earths oldest monuments and in the way is a alien race who fights using telekinesis to kill demon troops with physiological warfare and the only people who could stop the army is 5 advanced demons and the main character 005X (or 5) gets separated form the others when the SSRS tangent gets split in half and the longer 5 stays away from the demon assault army the more he resists the DAA's cause and grows his feral instincts and the DAA chase him down to death and he eventually faces his own friends 1,2,3,and 4