absolutely amazing work for a first game, and in 30 days too!! actual feedback below, but first I just wanna say this is something you should be proud of, no matter how "fun" it is, it's really well done
Things I liked a lot:
Your atmosphere was genuinely unsettling, the breathing and the emptiness and the fog all added up to me being pretty unnerved while I was looking for the outpost
Your scene composition was great, with the signs pointing off into the fog and things just barely visible, the farm with the single lamp post -- really good stuff
The 3D terrain and textures were really well done
The character controller was very smooth and worked well
that procedural (I assume?) animation for the crop I got to plant was pretty brilliant
Things I suggest:
Raycast3D on your player camera for item interactions
put a flashlight on your player if you keep doing horror themed stuff, it adds so much
but seriously you're just starting and you're doing awesome, excited to see what you do in the future bc you really have a knack for scary atmosphere