That's amazing. A demonstration that you don't need complex objects to make an enjoyable game. A few shiny spheres, squares and polygons will suffice.
Rewind feature works like a charm, I liked the idea to be able to choose to rewind objects or whole scene, that should be hard as hell to develop! I can't imagine how could I code that in 1 week.
This one will definitely turn to a gem if you make the starting sections easier to let player get used to pace.