Our drawing speed are pretty slow so I should say that there are not really a lot of differences between the nightly builds and the demo version (we always tried to push finalized changes to the stable/demo builds as frequent as possible).
That is, unless we're doing a big redraw to our currently available components, in which case you can always see our devlog to get more information about it (it's located in the bottom area of the itch.io store page).
Thank you very much for your interest!