This is almost perfect... It just needs support for more text based content. If it's already supported then the demo needs some examples of it.

Text or HTML posts ?

oEmbed based links? Link in a txt file would be simple enough.

I'm not sure the best way for integrating these things, but I'm mentioning them because I'm always looking for simple blog tools, and it doesn't get simpler than files in a bucket. So this approach has me excited to see how far it can extend without the need to introduce additional components like Lambda or a normal Server.