the whole game you get told "time is running out" listen to it
the game mechanics are brilliant the aiming can be a little annoying when the people are walking but i do especially like the tagging mode. the story-line is good as-well with some very intriguing conversations, the best part about the story-line is the flash-"forwards" so to say. i also like all the different gadgets like the portable EMP, sticky camera etc. but my favorite of all is the see through walls thingy (that is the scientific term). and the way they've done it is very fair you can only stop and look not run and look.
although this game is its very short and the aiming can be annoying its good story-line and great game mechanics more than make up for it so over all id say its a great game