Great concept but I think the execution lost it a bit. The difficulty is pretty high right from the start, defiantly could have benefited from a more gentle ramp up on that. The controls were good, smooth and after a couple games felt natural. I would have liked some score indicator on screen as well, rather then only at the end. Also not sure if I just never made it far enough but once you get into the rythum of the game it gets repetitive quickly as the enemies are all the same. Lastly (and this is a personal comment but applicable to others I'm sure), I am colorblind and found it almost impossible to distinguish between some of the enemies colors. A little more distinction in the visuals would help out others like myself that have been cursed with limited sight.
Overall though, as I said the concept itself was good, met the theme well I think, and was enjoyable.