Wow, amazing game! I love the level design and the graphics!
I like the speedrun aspect of the game where you are also encouraged to go fast by the "gut" mechanic.
The only small issue that I had was with the difficulty, you can just run to the toilet without worrying too much about the zombies. Would love maybe more ways to deal with zombies like maybe some red barrels. It can also be nice to make the player have to go back to their car or starting area so that way players who just run from zombies will have to face them again later.