The overall effects are really nice. The puzzles are also designed well. mechanics are also cool. However few things I would like to add are maybe increase the player speed a little bit. There could be more puzzles added and puzzle solutions are a little vague, maybe more environmental instructions to the puzzle would be a good addition to the game. One more thing you could do is have some entities which chase you in the dark to intensify the game environment a bit. there could be shadows that haunt you. There is currently no drawback of going into complete darkness which is fine for a jam but for a full game it might be a little unsatisfying to bring the light back. I had fun figuring out the puzzles.