It would have been good if the music was made for the NES audio chip and you can't press LEFT and RIGHT at the same time on a NES controller (as most controllers).
Also I didn't find the keys much in tune with the music.
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Thanks for the comment and for playing! :) The issue with notes falling out of sync came up when printing out the web version and wasn't caught until submissions closed! Doh! ... but I'm looking forward to tuning it up later. Didn't even think about the "D-pad" matter! Interesting catch, whoops!
Adore your project btw - true NES vibes! LOVE your cover art.