This is pretty cool. I currently work at a place that builds a similar solution but for mobile apps effectively using Excel, or Google Sheets as the CMS. It's called AppSheet (https://www.appsheet.com) We've managed to make the "translation" from tables to a mobile paradigm quite efficient. but I see the biggest challenge in applying logic (that many people use in the spreadsheet itself) to the app. Very interesting to see how people use similar solutions. We are moving to Expressions to solve for logic limitations which would make it more robust for an advanced spreadsheet user.