Welcome to Snap!.
In the beginning, we were hoping to persuade the Scratch Team to adopt our core ideas (first class procedures and first class lists), and so we were careful to make as few changes as possible to Scratch, adding seven blocks and one button. But they weren't persuaded, and since then we have felt freer to diverge. We have followed some of their changes over time, while rejecting others (such as the demotion of the Pen blocks to a library you have to discover). We think we've moved past them in media computation by extending our core philosophy (everything first class) to costumes and sounds.
Personally I think their new flat design is hideous, although Jens kinda likes it. Something I wish they'd learned from us is zebra coloring:
which is one of the many small enhancements we've provided.
There's a big update on the horizon, almost a complete rewrite. But it's aimed mainly at improving browser performance rather than at adding features. (Although there are some of those too.)