Thanks for the feedback, this is still in early access and I'm Improving it as we speak, and oh yeah the zombies are supposed to kill you in one touch cause canonically they're stronger than the average zombies, but for the rest of the bugs I'll try to fix this issue as fast as I can :)
Update 0.0.2 Should fix most of your problems: "https://101studios.itch.io/honest/devlog/591036/update-002"
Please make sure to reach out to me if you have any more issues with the game, have a good day :)