This is a really cool tool, but all the example images are using Rpg Maker assets, which is a bit of a turn off to a lot of folks I'm sure. Do you plan on building your own asset set? Kind of like the official RTP packages?
One of the reasons I could bootstrap this project was because there are so many freely available graphics out there. Although I put a lot of effort into making sure not to use anything from RTP.
Unfortunately this has the drawback of being a "rpg maker" clone. Getting traction on Twitter is therefore really hard.
When I ever do custom assets, they will be 3D.
Or give users to use custom graphics and share/sell them.