The beginning of Game of Thrones theme:

    g e rvg e rvc
    v s rcv s rce
    (bhu g bhu g bhu g)

I love the idea of having a layout where all patterns are movable. Going diagonally up-right gives you whole tone steps, diagonally down-right gives you semitone steps. An octave is QT, a major triad is QSD, a minor triad is QWD, a major scale is QZSXDRVT or AWXECFTG or ASEDRVGB. I could pick this up right away, in some ways it's easier than the piano, which I've played a lot. I really wish there was touch response, but computer keyboards don't support it.

The behavior of cmd as the pedal is a little weird. When you release the pedal, the sound should stop. Maybe it's just a Mac bug, though.

The top row seems to be an octave higher than it should be, that interferes with moveability. Though I understand you probably wanted to expand the range.