[lgvld]

Just in term of user interface, actually. Something makes me feel awkard, I don’t know why... It looks like I am manipulating colored potatoes, while I am expecting to manipulate data, by writing pure functions... ;-)

But maybe children love the way Scrath looks?

[abecedarius]

You might enjoy http://www.toontalk.com/ for something more like manipulating data. (I played with it years ago before the web version was made.)