[cbhl]

Personally, I'd love to see you optimize for people who start and iterate upon an app from a mobile device and preview/use the app on the same device. Since the messages are just English text, the extra presses to type curly/square braces don't constrain you on mobile. Sometimes I get writer's block at my computer in a way that I don't get on my phone.

In particular, I'd hide/disable the sign-in-with-Google pop-up on phone-size screens (it takes a third of the screen for me), and make sure that CSS/styling makes everything fit on the code and preview screens on a phone, even in mWeb.