It's too long.
I wanted to fall asleep, but I waited for something to happen. Not much really happened. But it has potential. There's no twist or whatever so that's why I felt bummed. You can sleep for a couple minutes and still you're still in the same scene. Too much unnecessary lines. Don't afraid to add giant monsters, they're like just mediocre. I expected too much from the zombies. I don't care if it's stupid, I just think it's too much seriousness. It should have been more action and less talking.