This is great, giving me Loom vibes (an old PC game, check it out if you haven't heard of it), very melancholy and moody. I love the puzzles but I got softlocked at the cube pushing puzzle where I managed to push it too close to the floor and couldn't find a way to reset it. Outside of that, the puzzles were a lot of fun to solve. I dont know if you would be interested in it, but I could totally see you turning this into a horror game. The light mechanic was a lot of fun to work with and practically begging to have some monsters that chase you the weaker your light gets.
Great game!