Cool concept and it's very impressive that you made all of the models yourself!
At first I was switching the camera feeds to see if any of the objects moved or disappeared from the scene, I think I expected an idea similar to fnaf, which would be much more interesting and engaging.
It would be a funny idea to make the critter feel more alive, for example to place a cake in the kitchen, and as the time comes by the cake would be eaten by the critter. Then the player would probably assume that the cake was the critter! I think there's a lot of potential in this investigation format.
And I loved the phone calling mechanic!
Oh and I had one technical problem: I'm playing on a ultrawide monitor and the controls were unreadable, since they moved onto the white door... This looks like ui anchoring issue, which you can easily fix by looking up "ui anchors in godot 4".