Love your game. I was missing a visual cue, for when everything was lit up. So after the first couple of seconds did try with audio and there was an audio cue. Awesome cutout shader and good art. The nightmare deamons were also cool and i love how they fade out when come into light. I also love that the lantern had limited lifetime, so that I needed to plan ahead.
So only real feedback: maybe add a visual cue for when everything is lid. And add more levels after the jam. If you decide to work on the game after the jam, please reply so that I can continue playing.