So, I'd say there is definitely enough mechanically going on to keep me entertained. The graphics are excellent, voice acting is. fine, and it's free!
Now onto the actual review:
My two biggest issues with this game are The Fox Girl and The lure system.
Firstly, When I got to night 3, I assumed that her mechanic was going to be like spring trap, in that you need to lure her around the building to keep her away. Instead, she basically acts as Freddy, but you have to shine the light on her to "duel" her. I feel like out of all the characters, she's by far the weakest as she's not that big of a threat once you know how to deal with her. Also, her mechanic feels out of place. I know it's from "A Bite at Freddy's" but it feels weird here.
Secondly, The lure system. It might as well not exist. I don't think I have ever seen a Lure system implemented so poorly before. The game explicitly tells you that "well it might not work all the time" and that "it only works on 2 of the girls." I hate this. There is no point in adding a mechanic like that if there isn't any good feedback. By night 4-5 you only get 2 uses before having to repair it. By then, if you managed to somehow lure them (which is like, 20% of the time) then congrats, you've basically stunned 1 animatronic for 5 seconds.
Another issue is that the Lure does not work if the animatronic doesn't have a model for that room. Meaning, the rooms you can actually lure someone like Chica to is about 3. There's also no feedback for clicking a cam. A little pulsing icon would be nice, like how FNAF 3 did it.
A third minor complaint I have is the puppet. It suffers from the FNAF 2 thing of "I can't look at anything else apart from her." While it's not as egregious as FNAF 2's puppet, (since in order to wind her box you see you shine your light on her, and the timer is very forgiving) it still has the same issue I just mentioned.
Bugs: There was a rare bug where I couldn't flip my camera. It happened on night 5 and only occurred once.
So long as Freddy sees you wearing a mask on the first frame, she will ignore you for the rest of her animation. It's quite comical knowing that I can get a repair done when the lights are flickering, and she looks as if she could kill (or kiss) me at any moment.
Fake vent noises. I'm unsure of what causes them, but randomly, the cue for an animatronic crawling through a vent will play. The Wolf girl presumably leaves through the hallway, and so there's no one to trigger it.
Overall, this game isn't bad by any means, a solid 7/10 for sure. I just wish there was a tiny bit more in terms of mechanics.