Great work adhering to the restrictions and use of the theme! You definitely got the creepy late-night in the dark graveyard vibes down with the music and slow creep of the ghosts.
It took me a second to figure out what was going on though - I didn't realise those were lights/safe zones that stopped the ghosts and was trying to traverse the entire thing in the dark. I think you should add a better explanation to your game page, something like "Run from light to light to avoid the ghosts in this endless graveyard escape!"