Playability:
Works a bit awkwardly on a mouse but with a pen it's great. Could use visual or auditory feedback about when you are correctly drawing the shape.
Theme:
Ties to the theme directly with gameplay. I like the idea of this being a performance in front of an audience.
Cleverness:
Incredibly clever idea that could be great for drawing warmups with a digital pen. Keep working on this and it could be something awesome.
Artistic Style:
Detailed, consistent, and pleasant. Great work!