you read the title

now, let's start off with the story! the story would be that, a year after the events of classic fnati, jake suddenly feels a very strange presence, maybe a voice, that is calling out to him from the island, so he decides to abandon everything and go there on his own with a boat, before doing this he sends greg a message about his plan, yet by the time greg manages to read it, jake has already arrived at the island, greg then in a hurry tries to call jake at the start of every night to try and convince him to leave (and eventually just ends up becoming more weird once he realizes how persistent jake is), telling him that he's imagining things and there's nothing important on the island, but jake won't budge! after night 3, after not discovering anything and by a tiny suggestion by greg, jake goes to pirate caverns where the presence would be felt much stronger than before, so he knew something was there, but didn't find anything concrete still, on night 5 however, the presence would get even stronger and start fluctuating, until it's revealed that it was all henry, the person whose body has been hidden in a mickey suit there for over a year, reanimated, there wasn't much else going on with him though other than being an enemy... after reaching 6 am, the power immediately shuts off and jake is left in darkness, the toons have become monstrous and more bloodthirsty than even before due to their anger of not getting to kill jake, which they turn into shades, after jake fucks with them for some time, the power turns back on and it would be revealed that ooooh aaaaah mortimer was controlling the toons and he wants you dead now super scary boss battle, after defeating him by surviving long enough, mortimer would willingly let jake leave due to how he would not be getting killed anytime soon, it would also be revealed that mortimer is the spirit of walt himself, like i said he would control the toons but basically there were some rules, the toons characterized by washed out and muddy colors, one glowing eye, and black fluid leaking out of them would be fully controlled by him and are the toons that were already there on the island, however, he would also create new toons which would be characterized by being melted and having no glowing eyes, which would wander by themselves but still follow his orders, the only real exceptions to this are ace and face who aren't under anyone's control, at least ace not fully

gameplay: the game mechanics would be pretty much identical to the original, the only exceptions being the audio would have an actual cooldown as well as cams controlled by the number keys, the character mechanics however, were planned to be greatly improved and more interesting
pnm: would enter the office from either the left or right door, you would have to shut the office's power off and he would leave, if you shut it off before he entered however, and he entered while it was off, then it turned back on, he would immediately jumpscare you, only to prevent you from spamming the power button on night 1, in pirate caverns stand still if he ever appeared in the same room as you
oswald: would appear on any cams with one of his 3 voicelines as the sound cue, you would have to find him and play the audio in the appropriate cam
disembodied: would enter your office (from the CEILING, like he would fall off onto the desk even) with the sound cue of continuous loud quacking, play the audio in cam 3, but if you're not fast enough, he'll never leave and begin activating your equipment randomly
daisy: would appear in the office with continuous loud quacking again, you would have to drag her out of the office otherwise she would permanently shut the power off
pnminnie: she would go into your office while your cams are up and trigger a fnaf 2-esque sequence where you would have to hide under the desk quickly enough until the lights stopped flickering, she would also float in the cams and office, as well as have a pasqually from rebooted-styled jumpscare, to reference her 1.0 killscreen
impurity (who would be felix the cat, still female): she would start in cam 3 and go on a path to cam 1 then to your office, you would have to watch her on the cams as much as you could to stall her
acephalous: when he entered the meat freezer, you would have to wait until he entered his second position phase in there, because he would soon enter the office, you would have to do absolutely nothing until he leaves while he was inside
the face: he would crawl inside the vents, with his noises getting louder and louder until at a certain point you would have to hide under the desk until you heard him fly down into the office and leave, in pirate caverns you would need to wait before entering a room by hovering your mouse over an entryway, if you heard rustling, use the ultraflash
slester: would occasionally appear on your vision and start fading in more and more, if you let him fade in fully, he would darken the vision more and more until you couldn't see, you would have to click on him to get him away
henry: you would need to watch his starting position, then once he appeared in the office, use the audio in the camera that he started in, if you heard/saw him running into your office from the meat freezer, shut the power off

there would also be planned cn exclusives, each referencing a scrapped character from the original!

abandoned mascot: everytime he moved, he would make a rustling sound, check the wires behind you and if he ever got too close you needed to release steam until he left
darkie: when he appears in your office shut off a camera.
monochromos: would attack at the start of every hour (except maybe 12) and pause the timer and characters, you would need to shut the power off 2 times while he was in the office then find him on the cameras and shut the corresponding camera off

the max mode ending would be a shot of the oblitus casa true nightmare ending at the end, henry would say "thank you, and goodbye" or whatever he says as a way of me thanking the player for playing the entire game and also showing how all of these fangames and cycles all lead up to casa's ending

that's pretty much it (other than a lot of smaller ideas i can't list), there were also some voicelines done and planned but i'm not going to reveal them due to potential cringe