You nailed this one (in the coffin)(which is in the tomb). I was also thinking about the old LCD-games from fast-food places, or even old Game-and-Watch's, so I'm exceedingly glad someone else saw it through.
What I find even more impressive is that due to this game being mouse-only for input, technically this game is mobile-friendly(albeit the game itself is tiny and in the corner of the browser) I will absolutely be playing this on my phone when I find myself bored. Brilliant, and factually totally intended!! XD