I realise you made this in 6 hours and for that you didn't do a bad job! The only real drawback is you can't be killed and you can't win, so it's kind of an endless shooter with no threat xD.  One thing to remember to do in future projects, when you pause, give the user the mouse cursor back, you can't actually use the menu else xD

Good effort for a small amount of time dude!

Hi! Nice that you also have submitted a game, I liked the feeling of movement, but I had a lot of issues with other parts of the game. 

I can agree with the z-fighting textures. Textures are clipping on the buildings. The zombies seem to be equally slow and do not pose any thread, sounds and effects/polish is a bit lackluster. There is no cap on the x rotation of the player, so I could look upwards until I was upside down, and the controls were inverted, this was a fun additional challenge. Fog was a nice effect. It was atmospheric to a part, but the floating gun and the sounds broke immersion. 

• Escape, brings up the menu, but doesn't release the mouse
• really bad z-fighting on meshes.
• good job at making a game in almost no time.
• music/gun sound balance is a bit off... the first shot startled me with how loud it was