Enemy bullets in Bootcamp always miss the player

Is it just me or is it impossible for enemies to hit the player?

Every time I play the demo on the Unity website the enemy bullets simply fly right through me if they managed to hit me and there's no damage. I receive the 'One Man Army' achievement at the end without fail, even if I choose to ignore every last enemy and walk by. I don't have access to the project files for the full thing and you probably don't either so what I'm really asking is if others experience this same problem and if not what do you think could cause it?