Sounds _exactly_ like Shadertoy. Is this different somehow?
What I'd love to see is something like an 'annotated shadertoy', which encourages inline documentation and explanation of the various moving parts. If anything like this exists, I'd love to hear about it!
It look more like a web version of Bonzomatic than a clone of ShaderToy :) .
If I got one feedback to give, it would be to have a quick style switcher on the website. Some shader make the code difficult to see properly (like dark shader on top of this dark theme).