Ok, I'm just gonna make this somewhat short and sweet:
Take an animator that's amazing, take a good story, and take First Person, and you've got yourself something that feels like a movie or demo-movie. This is something that deserves to be a game.
This also gives me a couple FNaF: New Generation vibes since they used the same and/or similar models. Drawkills was also a very good FNaF Clone, of course being far better than the original games made by Scott Cawthon. This is a great idea that should have been executed differently, which was in the way of an actual game, and not a fake gameplay animation. But now, that's finally happening.
Really excited for this demo to come out, but a couple of cool ideas come to mind, like, you have the sneaky, quiet and stealth story of Bonnie (who's a girl for some reason) helping out the girl who supposedly just lost her frontal lobe and was on the way to the hospital. Why not add other variations of the story? Or add new stories all together? Extras? More content than just the animation offered?
Honestly I would like to see a story of instead of sneaking, you play as a character that's willing to, like, fight her way through. FNaF has never seen a combat fan game yet, and honestly, beating up drawkill Foxy at the beginning of the game just sounds... very satisfying. Anyways, it's just an idea that would honestly probably ruin the idea of the game, which is about the little girl getting through the hell she was put into by the Purple Guy.
However, one question can be answered immediately... WHY IS BONNIE A GIRL??????
I see something great coming, and I'm excited for the demo in the summer and the full release of this game before the end of 2018.
Good luck.