Also a fan of Malinowski's animated music videos. My immediate thought was that it would be cool to see this extension sort of mimic his piano roll animations by having it appear vertically on the left. Less pixel space though, so I don't know...

Would also be cool if the dots on the pitch line that represent accidentals were perhaps a slightly darker shade so it'd be easier to see the typical piano pattern in them. (Like ⦾⦿⦾⦿⦾⦾⦿⦾⦿⦾⦿⦾ kinda thing.)

Anyway, to original poster: very cool extension, thanks for sharing! :)