Nice game ;) I had some problems playing it, but anyway a great submission!
Some suggestions:
< You could add an effect on hitting the bullet, so that it would be easier to indicate if I shoot well or not, or if I were shooted.
< I really enjoy graphics and blurred background. Maybe it would be good to add some glow to objects, it might make them look awesome.
<I didn't really get how rewinding works there, so I would appreciate some tutorial on it :P
Anyway, a really nice entry. Hope you had fun!