What exactly would be different between a Scratch for kids and a Scratch for adults?
One problem I see with Scratch is its slow pace in moving forward away from flash and toward something that is easy to self-host: cloud only is great until underpowered Internet at your local library forces kids to stop coding mid session. Flash can sometimes be a challenge to get to work reliably in a modern browser on a pc you might not have admin rights on (compared to something based on fairly conservative js, like https://www.lively-kernel.org/).
I've briefly looked at the Berkley snap!-project, and it looks a little easier to get into self-hosting and modifying (but I've yet to do so): https://snap.berkeley.edu/
In the same breath, I should probably also mention croquet/cobalt - although it appears no one has yet picked it up and ported it to the new generation of vr headsets:
To save some searching: http://pharo.org/
(generally spoken - I don't know the scratch situation)
I think there isn't a Scratch for artists/professionals to create because the educational aspect is hard to nail, and pairing that with a publishing tool is even harder. It's not impossible, but it sounds really hard to get right.
https://en.m.wikipedia.org/wiki/Visual_programming_language#...
Why isn't there a Scratch for adults? A serious tool targeted to artists and professionals that makes it easy to publish interactive stories and presentations using standard web tech.