It looks like you've almost beaten all of the current content! I'm happy that you've played it to the end.
The only 2 functional challenges are the sand and city ones though so zunda of the night is actually really easy right now and won't give anything when done lol.
Right now I'm working on quality of life changes like automation and some new story/art things, so it'll be a few weeks before I actually code the next part of the content.