Loved the art style in this game, was really nice (Only wish I could rate you on that)! The knife weirdly randomly stopped working for me, even though i had like 80/90% stamina, dunno what was going on there.  As I've said to others, I'm not a big fan of mixing keyboard and mouse on side scrollers, would have been nicer to have a key option there :) Good effort dude!

Edit: Also please remember to remove the SteamVR stuff when building your game, it keeps opening it when I launch your game :P ( I think it was yours)

the game looks plays fun but there is a way to cheat in this game. 

[Spoilers]  you can sit behind the tables and barrels when shooting the zombies bullets will just fly through it also the zombie AI isn't very smart it only attack you when it see you and if you jump.