that sounds great, do be sure to credit me though. I dont have the game files but i do have a working mac build of the game and a very old unity project that had the zombie movement and basic menu if you want.
unfortunately there isnt a windows build of the game as i made the game on mac and the windows builds never formatted properly and wouldnt work. i can link you to my old youtube channel where i posted about the game which is here: https://www.youtube.com/@jjsplace8843 also i actually did complete 4 out of the five missions in the story mode but if you want the base of the premise, basically a new faction arises, they are a bit like nazis and they take over most of the world, then they use all the dead bodies as undead grunts to fight the last resistance, which is who you fight for. if you want some help with the story or what models and stuff to use feel free to add me on discord jordanian_militant