It is nice to play. I went until level 5, taking about 5 minutes for each level. It is easy to learn & play, controls are kept simple and intuitive.
Points for improvement in my opinion are: Enemies are sometimes behind walls (due to camera angle), perhaps give them a 'red outline' that is visible through all layers when this is the case. The objects when played in windowed mode are too small. Otherwise impressive product for 2 weeks!