A new version with a few bug fixes is now in the Nokia/Ovi Store:
http://store.ovi.com/content/308439
Very little has changed other than bug fixes (We've had a new baby this summer).

@derliebewolf: I don't think that's possible without writing some C++ (Grrok is pure QML at the moment). I do plan to look into it but haven't

@kozzi: I expect so but haven't tried it.