This is such a cool concept but wow is the first night really difficult. Not because it's that hard once you've figured out the mechanics, but because I don't know how any of the mechanics work and the game throws them all at you on night 1.
I didn't realize there was more than one Teddy in the room at first so I spent a long time trying to grab the wrong one. The ducks make squeaking noises randomly when you move, the old Teddy drains your sanity meter while you hold it, it took me a few deaths to figure these mechanics out. I didn't realize that standing in the light replenishes your sanity until after I realized that squeaking ducks replenishes sanity, so I thought I needed a duck for the solution to night one.
I think the game would be a lot more enjoyable and less confusing if you introduced the different mechanics one at a time and in an easier setting than night one.
But other than that, the aesthetics were great, the atmosphere is really creepy and the mechanics are well polished. I enjoyed the game a lot more once I was able to get through the first night