Wanted to share something for once :) After some amount of hours of trial and error and a lot of googling I managed to do the following modifications to the Prototype 2 game.
Changed the Player character to move position by Space.World and and rotation by mousepointer. Also changed sandwich shooting to left mouse button.
Changed the animals to spawn from around the screen and to always run towards the Player.
It was quite the challenge for me making the character rotate correctly and making a prefab target a gameobject that was already in the scene.