The music is nice, and playing along with it as a mechanic is inherently enjoyable. The platforming itself however is stiff, oversensitive, whatever the word is for velocity.x = input.x. Some acceleration would go a long way to making this more fun to play. Music's nice, I don't know if James made it for this game specifically, I don't know who that is, but I will at least complement you on the choice of music.
The art is what it is, looks good for what it is, although it's cheating add red into 1-bit art, you heathen.