I'm amazed by the amount of artwork and music you guys have produced in just 15 days!
Animations especially are really stylish and fluid.
I wish the first levels were easier and the difficulty upgraded through the levels, as well as sound and (bigger) visual feedback when you fail a key (easier to say than do tho). I think not having a "fail stage" is been a really good decision for this game too. As a player, you just want to see how the story keeps going!