Hello World on Lily

I tried to install Lily on my Firefox after watching this movie.
What I did was to download its 'Public Beta 1' from the page above, and then dragged lily.xpi onto the browser Firefox. However it required to restart the browser, it was pretty easy.

Then, as the following image, I created the new patch by 'Tools > Lily > New' and made the first hello world program.
I was impressed that its help docs are made by Lily itself. It's so cool.

By the way, it reminds me of Gakken's 電子ブロック that I wanted to have in my childhood.