This is very impressive.

I got further with this in fifteen minutes on my iPhone lying in bed than an hour last night with the Windows Phone 8 SDK.

The APIs seem nicely designed and the interface works surprisingly well on a phone. I haven't seen anything else as likely to democratize programming since Click 'n Play back in the 90s.

It would be nice to see some kind of automatic wrapper facility for the full API, even if the syntax became necessarily horrible and it was hidden behind an expert panel. Sooner or later every large project will want to step beyond the bounds of the current garden, I think.