It's very similar to Mint (https://mint-lang.com/) which I'm building for some time now.

Looking at the samples, it seems Ripple is going the same direction as Mint:

- explicit component definitions

- inlined control flow in HTML tags

- component based styling

- explicit white space handling for element content

- syntax for setting references

I'm not sure why they based it on TypeScript instead of creating a new language completely, since there are a lot of new syntax added (and they have their own extension as well).

If you are looking for something similar, give Mint a try, it has a lot more features, and I'm looking to release 1.0 in the near future.