This has been a toy project of mine for a while. You can play with the examples in the browser-based IDE here:
Factorial function: http://nickretallack.com/visual_language/#/ace0c51e4ee3f9d7483ec10780d1ed43 Move a box around: http://nickretallack.com/visual_language/#/f2983238d90bd3e0aede71aeec767ce1
What you see right now is an ugly prototype that doesn't allow you to share your code or work on a touch device yet, but I figure it will be pretty awesome when you can do those things.
Btw, this isn't a copycat of NoFloJS. I started working on this in 2011, long before I'd heard of them. I was surprised at their success on Kickstarter, which makes me think perhaps there is interest in this sort of programming after all.
Criticism is welcome.