Hey!
I played through the beta and here are my thoughts.
SPOILERS AHEAD
I liked the atmosphere, the creepy pictures, the tv showing piano performance after doing the clock puzzle, that was a bit unnerving to go into the basement and see what happens. The switching between worlds mechanic was nice, I liked that sometimes you get to see more and sometimes it even opens new areas or teleports you into a cabin near the house. Definitelly interesting.
I know this is only beta but in my opinion it really needs more story, plot and some meaning behind the puzzles and the setting. Now it's a spooky house with some puzzles where you have to find numbers to put in the right places, that doesn't make sense, at least for me. Sure there's some story with the kids seeing some demon or devil, I think it's overused at this point. But nonetheless, it still can be creepy and scary.
But... The jumpscares. The song plays, turn around, boom and please continue your investigation, detective. It just doesn't make sense and it's cheap. It's kinda well made with the animations and sounds but it's cheap because it has nothing to do with anything. The monster playing piano in the basement was quite good though, it didn't do jumpscare the jumpscare but it gave the creepiness and progressed the game since you get an item that's left on the piano.
A few tiny details that might need to be worked on - the ladder in the basement doesn't have a collider, you can go through it, I also think there could be more sounds for interaction, footsteps and things like that. You may already know about these things.
Overall - nice atmosphere, cool mechanic switching between worlds, although cheap scares, really lacking story and plot (at least for my taste) and it kinda falls between many other "horror" games where you do key hunt puzzles and get scared for no reason from time to time.
But hey! Maybe you want to make this game the way it is, so feel free to not listen to me if that's the case, I'm just giving you my feedback. :)