The fact that you are searching for the "new" version on GitHub suggests that the game is alive. Unlike abandoned fangames that disappear into the void, open-source projects on GitHub have a longer half-life. Even if the original creator stops updating, a "fork" (a copy of the code) can be picked up by a new developer.
Instead of facing animatronic animals in a pizza place, you play as a school janitor working the graveyard shift. The "monsters" in this scenario are, fittingly, terrifyingly redesigned erasers with creepily drawn faces and long paperclip limbs. Key Features of the Game five nights at winstons github new