Love the silhouettes. Also the music is very creepy. The use of primary colors works well for this environment, I think. And the appearance of the robed figures was an effective surprise. The timer on an activated generator adds a good challenge without being frustrating.
In terms of suggestions, I would have spawned the player facing the puzzle. I also think it would be helpful to specify in the instructions that you need to walk into the generators to push them around... I was trying to click them with the mouse.