Not Bad
Pretty decent job. Few comments however. Your ranking system or whatever takes off points for hitting a direction even when there is no arrow going by it. Thus if you timed it wrong, you are punished for both missing the key, and hitting the key at the wrong time. Not the way real ddr works, thus I didn't like it. Call it DDR, follow its rules. Also, the "Perfect, miss, etc" text was too big and distracting, tone it down a bit.