The graphics and game mechanics of the game are quite good as it reminds me of a mix of call of duty, resident evil 7 and left 4 dead games. I liked the use of limited inventory space and the various guns made available in the game. It would be better if there was a crosshair though but if you are trying to make it more realistic then no crosshair is cool.
I hope that more variety of regular zombies and zombie bosses could be added to the game like Back 4 Blood so that the whole experience is more immersive and enable multiplayer gameplay in the long run. To be honest, this game is quite similar to Back 4 Blood so maybe you could add other interesting and new concepts into the game to make it different from similar zombie games. The addition of the limited inventory space may come in quite handy in creating more things to do in the game.
I do love fps shooter games and this is quite up my alley. If multiplayer (2-4 players), do come out, please notify me again as I would love to play a game like this with my friends. Thank you for reading my comment and I wish you good luck in your future endeavours.