there aren't many games that feel finished on here, but this is one of the exceptions. the graphics are great, the music fits, the game is easy to pick up but the systems let you add a lot of depth due to the interaction between the level design, the player, the enemies and the timer/score system. I think you would need a bit of extra sauce to make it fun for a longer game, like some power ups (speed boosts etc.) and extra square types (switches maybe) as it started to get a bit boring after about the 10th level with the main mechanics just being to move around; but for a game jam short game it's very strong. The thing that immediately comes to mind is pac-man and how it changes modes from running away to chasing to keep things fresh. Obviously you can kill the enemies by surrounding them, but it still "feels" the same as just lighting the squares to clear the level. So some extra modes/ideas that would "feel" a bit different to add some spice. Just thinking for like a Steam release or something like that, as it's a solid concept that you should do something with later on :) A multiplayer online mode where you play with your friends and try to act like the black ghost and turn off your friends' lights would be really fun and maybe get you on streaming, especially if the game was free to play with some like booster packs or whatever for monetization
Great work!