Thank you for checking out the game and giving feedback!
Initially, you were supposed to be able to see the glowing part of the Bloop Fish and red orbs outside of the player light area (so basically the entire screen). I messed up when I tried to get fancy and have the boss "turn off the light" T^T now I regret it A LOT (maybe I shouldn't have pushed my luck lol)
Glad you enjoy the concept and the music choice though.