The first time I played this, I couldn't figure out what was going on at all. I struggled with the controls, couldn't understand why I could only sometimes view the cameras, and couldn't figure out what do actually do.
The second time I played it, I got a little bit further. I re-read the instructions and figured out you had to be facing outward to view the cameras (I still find this clunk and unintuitive), and dismissed the radio when it started making noise. I did cycle through the cameras a bit, at first nothing seemed to be moving though I noticed one graphic changed each time I looked at it. Eventually stuff started moving, and then something appeared in front of the door but I didn't realize it right away because I was looking the other way and then I couldn't figure out what to actually do about it and then the tortoise woke up.
One thing I didn't really understand until very late in the game was that the tortoise on the pillow in front of me is what I need to keep asleep. Until that point, I was very confused about the purpose of closing the door; I thought it was to protect myself from the monsters and didn't realize it had anything to do with the goal of keeping the tortoise asleep at all.
I think this is both going to be funnier and easier to play for people who are familiar with Five Nights At Freddy's. I've never actually played that game, so a lot of this just went over my head.