Probably the most polished of all the games I've played from this jam so far. It's quite the incredible product for 3 days of work, I'm impressed!
It was a wonderful use of the "echoes" theme, I enjoyed the story and of course I absolutely loved the visuals. Undoubtedly in the top 5 games created for this jam.
---Spoilers for those yet to finish---
I really liked how you could see the state of the house deteriorate throughout the game matching the mental state of the character, the overall mood was very eerie and was great for a horror game. I do think the player experience is wildly different if you read the itch.io page or not, I imagine I would've been quite confused at first had I not read it but at the same time I almost feel that it gives too much away and takes a bit from the mystery of it all. Perhaps try wording it to be a bit more vague and mysterious rather than directly stating the whole murder scenario.
If I were to make any direct critiques I would recommend making it so the player can't clap in the final cutscene with the police because it was honestly a little goofy to have this tense moment only to be able to just start clapping randomly.
---End of spoilers---
Fantastic work though! I had a lot of fun and enjoyed what I saw. I'm excited to see what you make in the future!