This looks fantastic! I was drooling during the demo video - you've improved on so many things from the standard spreadsheet at once.

If I could make a request for the API: it's almost impossible to get a simple JSON serialization of a table in Google Spreadsheets. There are so many times where I just want to make a really simple MVP with a backend data source, but don't want a full-fledged Firebase database. If I could just stick my data in an Airtable sheet and point my Javascript to load it and create the page dynamically, that would be ideal.