I needed three tries to finish the game, so that falls into the "not too easy, not too hard" territory. I missed having additional objectives or some difficulty ramping when lighting up the candles (Like spawning more monsters or so).
The eyes mechanic, however, was very interesting. I think it could be expanded even further. The left eye (Revealing the candles location) had a clear drawback: revealing your position to the monster, but the right eye had only advantages (Revealing the monster position). Maybe that could be improved somehow.
Still, the game felt pretty solid and the visuals were really good. Congrats! ;)