Cool puzzle! Also very good visuals and audio for the game.
The puzzles are very good, but I will note that I lingered on the switches for a long time, since rather small sprites change on the screen, and it was difficult to notice when the door/piston opens and where on the screen. I think in such an environment it would be possible to add dust particles flying off the changing object to increase the visibility of the change.
The iterative complication of the same level is done quite well! Well done!