I thought this was a great use of the limitation, and the flashlight mechanic was really cool to see implemented like this! Art and audio for y'alls game was solid, though I do think there was a missed opportunity to give the monster more character; I'd have tried to either bring in more art/animation for it or leaned in even harder to the box/obfuscated aesthetic (maybe they're literally under a box but you only see little glowing eyes peek out when you stop them with your flashlight, or it's censored/blurred out so you never get to actually see it). I got stuck on the puzzle with multiple lanterns, but I gave it several tries before throwing in the towel and had fun along the way.
BTW the game seems to crash the tab on Safari/macOS—there weren't any logs output to the dev console or I'd have shared those. Not sure why. It did work for me when I played it in Firefox.