I really liked this game.
It was well-paced, well-executed, and very well though-out.
Absolutely the best-made FNaF fangame I have ever played, and I would attribute that mostly to the awesome sound-design and ambient noise, as well in part by the solid game mechanics.

Personally, the insanity meter as a game mechanic was a bit lost on me, and it was a little too difficult to get a grip on, but once I got past it the rest of the game was A+.
This was an awesome experience, and Nikson really has something he can be pretty proud of, and I wish him luck on any of his future ventures, with the hopes of playing them myself at some point.

I even made a little play-through that anyone can watch if they're bored, though I don't expect them too. :P.

Part 1: https://www.youtube.com/watch?v=vKzhbNHBDww&t=1s
Part 2: https://www.youtube.com/watch?v=r6KDn1OcngI