You've found all there is to find in this version. I put this out as a preview for the big UI changes. The rest will come when it comes!
The slime scene images being broken will be fixed when I put out the next update. You can fix it manually though by renaming the image files to be all lower case.
I don't know if just opening the html in visual studio is going to be that helpful! Development is done through split up serarate files. The html file is compiled from those.