I really like your take on the theme but there are some minor issues that have a bad influence on the overall experience.
I had no idea about the controls and had to figure out how the rewind mechanic works via trial and error. Moreover it would be very usefule to have a start button on the keyboard instead of using the mouse and then switching quickly to the keyboard.
It was also very frustrating to restart manually everytime I died since there's no respawn.
Once these minor issues are resolved it will be a great game, in my opinion.
The theming is really good and it is aesthetically stunning. Nice job there!