I was not familiar with the Bitsy 3D engine but without a doubt this game has a rather curious aesthetic and the theme is quite nice of someone exploring the house accompanied by the sound of a pleasant rain.
Of course, I can't fully understand what the role of the control room at the end is but I suppose it is a creation of the ghost to control the doors and other things that make the protagonist end up outside in the rain while going for a walk outside , although it may all just be a strange dream that ends in the end as a peaceful dream.