I really enjoyed this! Even though the mechanics are simple, the game has huge potential. The menus are very polished and look great. It took me a while, but I managed to beat it.
Regarding the feedback about needing a tutorial: I actually disagree. Part of the charm is learning by trial and error; it made the experience much more interesting. To be honest, I didn't feel the horror aspect as much because I was so focused on survival—I was completely 'locked in' repairing the door and running to get upgrades.
You have a very solid base here and can definitely keep growing the project from this. Great job!