Well done, you definitely nailed the theme! Game played solidly, although I agree with FishyGames that you need to implement some sort of cursor lock as several times I was clicking out of the game causing my score to suffer. I liked the aspect of protecting the people around you, but I think it would be a good idea to add icons with health indicators either at the bottom or hugging the sides of the screen when the characters go off screen because it's not clear how many people are left and what their health is if you can't see them. Graphics were good, looked like it could have come out on the NES had there been a pandemic back during that time! One minor suggestion, for the bigger red virus enemies maybe add a small health bar or some sort of flashing indicator that they are being hit/taking damage as its difficult to tell right now if you're damaging them at all until they disappear.

My only problem was the mouse indicator with black tons in a black background, and the mouse indicator doesn't follow the mouse, however, the game have nice graphics, and the playbility is good