The game is a little difficult because the bullets fire straight and if you point directly at a zombie, the bullets go past the zombie to either side. Also my mouse seems to direct where i'm pointing, which is nice up until i'm backed up into a corner, so a border might have been nice. Turning also wasn't centered, which might have been okay is it were centered on the wheels depending on which way you turn, but it wasn't so it just felt awkward. In the end, it was really just backing up into a corner and firing that worked since there wasn't really a reason to not do that.
that being said, i like the touch of the guns needing to rest if you use them too much and they heat up too much to use.