Great puzzle game, would love to see it expanded with a story. The limiting light source does give it a claustrophobic feel to it in the beggining. That's a great starting point and down the line you can upgrade your seeing radius and it'd be a nice way to see progress on your player.
Solid blocks and switches look very similar to each other, one puzzle I was stuck until I realized that one switch wasn't a solid block.
It's a solid loop, I think adding bits of story in between puzzles and you'll have a solid game in your hands.