I’m enjoying using Observable! Here’s one piece of feedback, in case it’s useful.
Yesterday I was using Observable while flying without internet access. It worked really well… until I accidentally evaluated an infinite loop. It prompted me, I clicked the “Safe mode” button, and it showed “It looks like you’re currently offline. Please connect to the internet to continue using Observable.” That effectively ended my work session. So I would have benefited if Observable had offline safe mode (and, in general, it’s valuable to me to have reliable offline access to Observable).