I have now achieved Zunda of Night and am trying to fully charge Kbity and enjoying it very much.
As for the Atlas Reset, it seems that even if you have already consumed it and it says "You have already reset.", you can still reset it by clicking on it.
But I have not seen any other glitches.
I was very surprised to find that green little one waiting for me at the end of hell! Poor thing is cowering in what looks like a little cardboard house, but cute!
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.