Interesting stuff. I like it when devs play around with breaking the 4th wall, but I think you might end up scaring people off the game with the windows notif sound. It definitely made me think twice when I heard it. Kind of a more stressful horror that I'm not too keen on feeling. If you spend more time preparing the player for that kind of an experience, I think the moment might land a little smoother.
I encourage you to keep exploring these types of ideas though! Just be mindful that people are trusting you when they download your game, but it's generally a wary trust. Still, you had some creative ideas here, and an intriguing, if not a little confusing, plot. Good work!