TLDR: 8/10 would make coffee in again!
Given this is a demo I don't have too much to comment on in relation to the creepiness. I got a handful of events, mostly creepy with one giving me a good gut laugh! I also appreciate not using overly loud sfx whenever something spooky happens!
One thing I would like to see is perhaps a couple more angles for CCTV, simply for the fact that details such as damage to the front is brought up but never seen visually. I'm only theorising atm that the later nights may cut off 1 or 2 of the systems so it would be good to have the other angles as a backup for such descriptions if that's the case.
I also think a handful more daily tasks could help offer chances to make the player comfortable before throwing something at them. Think of how voices of the void waits for you to be in the routine before creepy stuff happens. Only 1-2 more tasks just to add a bit of variety outside of restocking. Perhaps just emptying the bin or unlocking / locking the window with a key, stuff that opens more opportunities for things to hide in the corner of your eye.
Overall its a fantastic demo and I can't wait to see what the final game has in store!