the control is too frustrating. concept wise it's really neat, but the constant shadow jumping makes it just plain annoying. good thing they put in the F & D keys or else it would be totally unplayable.
the beginning was annoying, just because the shapes are small and really hard to collect the bits. perhaps put the big squares on the first level and then followed by the smaller ones on later levels. the later levels are much better. i only wish there was a pilot type control, where up is thrust, and left and right are actually turns.