As a FNAF fan I do enjoy the multiple camera mechanics and I enjoyed the story! The only thing I would wanna point out is that I wish there was something more to do while watching the cameras(Almost like the TV, Door and light thing but more urgent) as it could get a little tedious just waiting for things to happen.
(Oh and I tried out the Mac version too but couldn't get it to work for some reason just so you know o.o)
Great work, keep it up! :D