Did you download the demo?
I didn't get the idea that it was a VTT though. I think it's a game in itself. It may have the ability to modify it but I don't think the GM would have much to do after it was all set up. All the combat and so on is built in from what I could tell. Did I miss something?
Either way, let me know how the demo is. I may d/l myself just to see what they have.