It's a bug that you can't change the weapons you're wearing, so you'll have to find a way to display the cursor so you can change them.
Secondly, I find it frustrating that none of the buttons are shown. And the fact that there's no menu, so you launch the game and start immediately.
A huge map so that there are only zombies near the house and in a few other places doesn't make sense. There's a huge, empty field all around where you can get lost without any zombies to kill or anything.
It takes up resources unnecessarily (having to generate all that to have nothing to do there.) Plus, you'd have to block access temporarily, until you add zombies everywhere.
Too bad the character doesn't have any clothes, it would be more logical and realistic if she had them at the start and "broke" when she received attacks, or you could make her serve as "armor" and only get fucked when the armor is completely broken and gone.
The character's face doesn't really match the rest of her body: her face is very smoothed out, resembling an anime like One Piece, while her body is quite realistic (well modeled).
You could add passive or active skills, while staying within the logic of the game (such as fast reloading, other types of grenades, being able to fend off zombies more easily, etc.). All that remains is to find out what ideas and how to get them.
The character tires too quickly. She should carry fewer weapons on her and she'll be able to run longer, she's stupid.
You've put in at least a dozen huge buildings that one can't get into, so I checked each one looking for the one I needed to go into to advance in the game. I couldn't find it.
There could at least be a little hint, like a map or radar or something.
I'm aware that the game is in its very early stages, and there's a lot of work to be done. So I really hope it will lead to something... finished. One day I hope... good luck.