Awesome Earthbound vibes, and nice execution of the silent protagonist theme. The escape room had a solid concept behind it, but the way it was done led for a bit of confusion. For example I checked my bed multiple times, but not in the right direction so I did not find the item on the first, second, or third pass. This was a bit frustrating. Having to recheck areas that did not provide items before is a bit rough as well.
Combat was a bit too long and one dimensional to be good. In fact I think having a single fight or no fights would have improved the overall experience, as the game was too short to have any level progression, and there was no good reason to learn new skills or level up.
I enjoyed the game and thought there was clever design and storytelling here. It felt like the first month of work done on a longer game, instead of a game created for a game jam, and it almost feels like you were stuck in that mindset. If this were created to be a shorter jam game, a few modifications could have helped, like giving a cure skill to start, totally scrapping experience and the skill learning system, reducing fights to 1 or 0, and possible a boss fight (a bigger rat perhaps?), perhaps an story arc that doesn't end too abruptly.
Hope you keep developing it though! Would love to get to the bottom of that strange creature and the MC's sister.