Great Game!
I tried to play your game and I'm really liking it so far. I completed all the levels. 
I've notice something when I tried to break the glass and look down. I tried to rotate my view to shoot the enemies and the view rotation feels really off. The view movement turned vice versa when I try to move my mouse to the left, it goes to right.
I understand since you only have 3 days to develop the game, I suggest you to make a re-usable script for your GUI and for your pause menu as well.
Other than that, great game! I like it.