This looks great! We're extensive users of retool but while it's great for internal tools, the pricing and auth model don't really work for external tools. So this definitely fills that gap. We literally just started our big partner dashboards project so I'm sending this over to the engineer working on it now.
One feature that's important to us is the ability to download tables as CSV. Sometimes those tables will be really large, so we'd want to paginate them but still allow the customer to download all the data in their csv. Is that something you can/will support?
Not to jump in here, but have you tried tools like https://github.com/Budibase/budibase that would allow you to build both internal and external tools.