Graphics are solid, gameplay is smooth, and I gotta give extra kudos for the shadows working correctly. (zombies in front of light sources cast shadows, making it possible to see the shadow of the zombie attacking you from behind in some spots, or the one about to walk around a corner. very cool.)

There are at least 2 'safe' zones.
1: if you go up the stairs inside the house, they never follow you or spawn there.
2: if you go to the back (left) corner of the front yard, and stay behind the wire fence (that is invisible and can be walked through from behind) all the zombies just freeze in place as they spawn, forever.

excellent game.

dinged it a half star for occasionally causing my mouse cursor to become invisible outside the game window while the game is running.

I found something game breaking though.... all I had to do was go up the stairs and bam, nothing could reach me. I had to jump to climb the stairs but climb them I did. From there I was utterly safe from the zombies.

You forgot to add Shift - Sprint in the command list! or was that intentional to raise the difficulty? Besides that, I'm quite pleased to try a Unity fps that runs this smooth, bug-free, with every command working properly AND an actual increase in difficulty wave by wave, even if that's just due to the random spawn of zombies behind you while shooting the pack ahed, it didn't feel unfair, just a quick back check after every now and then. Only minor complaint would be about the sniper rifle, i was expecting some heads to fly or splat as extra reward for headshottin' in the fray but that's for another game :) Keep up the good work!

This is 3-star game.
+ Textures
+ Unity
+ Bullettime
+ Weapons
but
- Stairs (you need to jump over them)
- Stupid zombies (if you go upstairs into the middle-house, they won't touch you)
- Gray, rutine graphics (try to add more fonts or make the game a little bit brighter, a little bit)

IT WONT LET ME PLAY D:<