I beat the game!
Though the torch pattern near the end is a bit archaic/unclear how to solve without pure trial and error (I think?), I really like the concept of hiding in the dark from the monsters, and the puzzle aspect. Also, the keys are a bit dark/hard to see in general. Not bad overall though!
*Edit: Ahhhh it had to do with the cell rooms! Count which ones are dark, and add them up!