Contrary to what everyone else says, this game isn't good. I found the game overly generic and lackluster.
The game isn't scary. The only time I was kind of spooked was when it was evening, and you hear the breathing behind you. Unfortunately the game doesn't play on that theme, and instead drops the brightness to zero, and throws a cheap jump scare at you. That's not scary, it's just bland, generic, and been done to death at this point. And after that loads of zombies are thrown at you, but they're slow and easy to dodge. To be fair, I don't think upping their difficulty would make it fun or appealing gameplay, it would just add to the tedium.
The controls are horrible, absolutely the worst part of this game in my opinion. WASD movement is floaty and feels bad. Your press W and move forward, when you let go you still move forward for a brief amount of time. Additionally, the the mouse movement stutters and lags around. I don't know if it's by choice, a bug, or an optimization issue, but it severely impacted my ability to play the game. And the cherry on top of all this, and this one I'm assuming is a bug, is that the mouse will sometimes randomly put you in a different direction than you're panning towards. Making it really hard to navigate and get your bearings. This trifecta of poor controls made it so difficult to play I gave up. I could 100% beat this game, but I'm not interested in fighting horrible controls to do that.
Something I did like at first is the options menu, for whatever reason a lot of indie games don't include one, but you did and I liked that. Until I realized it didn't save my settings, so I had to redo them each time I launched the game. The in-game pause menu is even worse though, because it plays an obnoxiously loud sound. Why? I don't know why you would do that. That is really bad.
I hope my criticism is met with enthusiasm to improve your game. I'm not being harsh for the sake of being harsh, I know this is your first game in Unity, and that it took 15 days to make. But, I feel like I'd being doing you a disservice if I lied and said this was good.