Fun idea! Like Plague Inc. but more personal. My one bit of feedback would be that your horde follows a little too closely at times. A number of times I would try to turn right and I would be locked in place by one of the horde, preventing me from turning without breaking away from them first. I'm not sure if you're using rigidbodies or not but if you are, you could always make the players mass higher so that you push them more than they push you. Otherwise, good idea and a fun game!