Really great game! It looks great and the menu's do to. I also like the music. However, my girlfriend seems to hate the music with a passion :)
I did encounter a couple of bugs, such as being able to walk on the bottom of the map while there is no ground there, some quirkiness with the moving platform and the falling block landing not aligned to the grid if you drop it from a great distance.
I played the first 5 levels, but there never seemed to be a reason to rewind time beyond gaining the ability to place the blocks again, which I think is a missed opportunity.
I would really appreciate it if you would have a look at my game as well :D