Truly amazing. I never saw a game quite with that kind of mechanics. The puzzles get progressively more challenging, and the final one was a good final puzzle. The ticking sound when it rewinds does get a bit annoying after a while, and rewinding can take quite a while for longer lasting flames. So it would have been nice if rewinding either sped up with time, or pressing R a second time made it rewind faster.
It was a lot of fun.