I like the overall idea and the third dimension of time and puzzles connected with it. I had no major setbacks while solving them Maybe the only thing that I really don't like here is the camera movement. It was dizzying for me and I didn't saw any usefulness to it.
And with the bug in the last level: yes, it was there, but as far as I knew it was just part of the story and the time switching still worked (although a bit differently).