When I click "Add projection texture", nothing changes. IIUC only the downloadable version changes, not the web version. It would be nice to show/hide a texture in the web version, so it's more clear.
Also, it adds some (random?) lines, I expected noise/grain.
Is it possible to add the option to download an animated gif?
Edit: I've added those features.
I actually changed it so that the preview you see is that actual image that gets exported. I like this better but it means that you'll get a little prompt for the text instead of editing it in place. I think it's a good compromise.
I also added a checkbox for making it animated.