Sure, here's a simplified text-based FNAF (Five Nights at Freddy's) game implemented as a single HTML file with JavaScript. It assumes smartphone operation and uses basic pictograms for simplicity. Note that this is a simplified version and does not include complex gameplay or graphics.
This implementation serves as a starting point for a text-based FNAF fan game where the game loop can be expanded to include more complex gameplay mechanics and interactions. Feel free to modify and enhance it further based on your preferences and requirements.