Haha, that was really cool! Iloved the bits of humour, and it was interesting swerving round zombies and grabbing weapons. It's a shame though, the experience was pretty badly ruined by these frequent lag spikes, where every 5 seconds, the game would freeze for around a second. This really sucks, cos the timer already feels very long, and if my math holds up, the five minute timer actually took six minutes. So another thing I'd do is reduce the timer, cos it felt like a long time to beat the level. It was also very easy, perhaps if the difficulty ramped throughout the level, it might be more engaging to stick with it for a few more levels. 

Overall, I really enjoyed the game, escpecially the graphics. I loved how the menu killed a zombie when you clicked the button, and the dudes were cool. I noticed that the zombies have different coloured shirts, but you can't see them from the camera angle! I loved everything about the style, and would love some more! The high speed action also would have been very neat, if it wasn't for those unfortunate lag spikes. 

Also, my opinion towards UE4 games has always been very negative, and I must say, this was a very refreshing surprise!