I just messed with it (I'm on Google Chrome btw) and the preview does work (at least for me). So far it looks very promising (although documentation, preset scripts, and some example projects might be nice as a complement to the engine). Keep doing what you're doing!
Hey there! Thanks for testing it. I hear you a lot about the docs/presets/examples, those are sorely missing! Thanks for the feedback :) Also nice name, I am a big fan of sourdough, I just baked a sourdough bread this morning (it rose over night) :D