Great horror entry with a clear vision! It's very easy to see what you're going for, and also easy to imagine how the game could continue to change and evolve over time in new levels.
I would love to get further in the game, but I'm having issues with the windows and I can't tell if I'm hitting bugs or just don't fully understand the mechanics. The tutorial mentioned that while windows are closed, they should shake every few seconds to remind me that they're closed, but I've never heard that happen. It seems like I'm able to close both windows simultaneously, and as long as I'm quick enough, I can successfully open them both back up independently. But if I close them both and wait a bit, when I go to open them back up, it turns out they've opened at some point without me realizing it, so I just close them again. Or maybe I'm only ever closing them, but one of the "close window" sound effects actually sounds like the window is opening instead and leading to my confusion. This keeps leading to monster deaths on windows that I know I've shut, so I was curious if they only stay shut for a few seconds and then open back up automatically, or if changing my focus releases all windows without me realizing it. If there are conditions that cause windows to open back up on their own, it would be great to play the "open window" sound effects so that I know exactly when this is happening.
Does soothing your sister speed up the night progression, or is that mechanic used for something else in later levels? It would be great if there were a way to quickly check on how far into the night you were, like FNAF's clocks.
Great premise, and I hope you keep working on it!