It was an interesting take on the theme, although i didn't really get a "running out" of power vibe as much as just transferring, granted there were ways to lose power, but that would just make you restart.
I think if you added some sort of timer so that the longer it took for you to solve the puzzle, the less energy would make it to the end, and then give the player a little feedback on how they did like '3 stars' if you get most of the energy, '2' for medium, and '1' for low, and you fail the level if all the energy runs out before you finish. I just think that would fit the theme a lot better.
Besides that, the audio and visuals worked well together and added a nice puzzle feel to the game