Ok so to start, I had to check out this game after reading your "How does your game fit the theme?" description, because it made me audibly gasp and go "oh my GOSH".
The chain bar at the bottom was a really nice bit of UI to have there (it gets red as it gets more taut?), the game ran flawlessly and buttery-smooth and I had to think about the puzzles quite a bit.
The ending cutscene was a really nice touch too. I think I would have liked to see more done on the presentation front to make each level look more like a prison or dungeon, and I did find the soundtrack a bit hard on the ears after a bit so a volume bar would be an excellent addition, but this was a very fun game! Great work! :D