The idea of the gameplay is:
Start a level in a room with an entry on the SCC(s) found on that level
Try and sneak past them/distract them/re-contain them to reach the elevator to get to the next (lower) level
If you want something with more gameplay, I have a straightforward FNAF2 parody that's almost finished (I don't recommend SNAB1 very much, it was my first 3D game and it's pretty amateurish). Most of the animatronics act like their canon counterparts with a few exceptions https://drmorningwood.itch.io/buckys2
It's in my old artstyle though, and a big emphasis on the "monster" in monstergirl