Made a very good initial impression on me, but really lost me in the end, unfortunately.
I liked all the world-building at the start: walking around the gallery, seeing the missing people posters, and so on (gave me a real Ib vibe). The little cutscene animations that played throughout were great as well. Traveling into the spooky realm, I enjoyed how creepy the game made it, with lots of subtle spooks like things or sounds popping up just off-screen or as you walk past them.
But then, it didn't take too long for me to get pancaked by a piano and say "oh, this is one of THOSE games" and lose interest immediately. "Those games" being horror games that ruin any chance of horror by killing you over-and-over without any hint or telegraph to avoid it: my initial immersion into the horror atmosphere was ruined as the game turned into a tedious sequence of trial-and-error, trial-and-error, trial-and-error. I'd be fine if there was significant and consistent logic and reason to all the deaths, but so many were just silly with no way to reasonably see them coming. To me, horror games are at their best when there is the threat of death, but it doesn't force you to suffer its consequences too much, for if it does so, it reminds you too much of the fact that you're playing a game and nothing can hurt you. And that's what happened with me: sure I got jumpscared a bit still, here and there, but I was no longer immersed and no longer enjoying it.
Having said all that, it might just not be my kind of jam: lots of people do seem to like these kill-happy trial-and-error type of games, and I doubt my feedback can make you change the game since it's such a core element to it, so in the end, best of luck in its future development.