Two comments:

(a)  Awesome!  Would you mind telling us more about your project?

(b) Every once in a while I find myself tempted to port Gem to Android, but then I wonder whether this would actually make sense.  Essentially, the way I see it, Gem maps a subset of OpenGL into Pd and controls graphics with Pd messages.  With libpd, you can use OpenGL directly in your client code and still exchange messages with Pd, and chances are that it'll be easier to do the math for OpenGL outside of Pd.  Any thoughts?

Cheers,
      Peter