Cool little demo, just thought the theme and sprites didn't really come through very clearly. I'm not entirely sure what I'm pressing on so I spam alt and ctrl while facing towards different things to figure out what to do. If you could simplify the flood tiles and make the wall sprites look more like a wall and less like a puddle it would help the intuitive read and make the game easier to understand. Grouping objects functionally based on luminosity is another thing you could do.
Despite this I think the puzzles were fun, don't know why the screen fades to black when I teleport through the side entrances.