Everything was fine until I found the first gas pump. After that, the net zombie took a 3rd of my fuel to kill and I used the last 2/3rds killing the shooting dude. They either have insane health or were too close to do damage.
Oh that's really cool that it's your first game! I love the concept that my ammo is also my fuel! It adds a lot of tension for gameplay since you're so nervous about wasting shots. I think you have an awesome idea here and I'm always down for killing zombies! Hit me up if you make any changes! And good luck on your exams!