Impressive work with the map and sound design - stellar game jam project!
I really liked the subtle atmosphere in this. The routine like tasks were simple, I was immersed right from the start. As the story progressed, the character became more obsessed with the "scratching" and that is very unique approach to horror as the player too might have felt this urge to find out what was going on. Good work.
I did mention couple of things that can be fixed after the jam, like the sensitivity is too high, I didn't like the sway effect. I also think translation to English can help to let others explore the game. In short, a decent update can definitely help the game's popularity.
Best of luck with the future installments.