This looks actually nice. We are building something very similar with Zero.sh (Aiming not only to visualize but also interact with data) - It's a very interesting space to be in!
so interesting. Love your demo! This is such a huge space and really depends on the persona you are going after. We are mainly doing visualization and expanding into simple writes. We have to be careful though since we are trying to our make tool super simple. Would love to try out your tool