As someone who used to work on ETL systems, from a distance, this looks basically like Tableau to me. (My first thought was actually "oh, neat, someone made an open-source Tableau clone!", but it's not open-source, is it?) You should describe how it's different.

If I'm going to pay money for a hosted application for serious work, I'm going to tend to prefer an established service that I'm confident will be around for a while. I'm sure you've got something good here but I'm not sure what it is.