For now, we're focused on doing some very important reworks to base systems. After that, we want to progress the main story a bit ;)
The next planned world, however, is called Kogetsu City and it's modern world
Mmmh unless I'm missing something, it's possible a variable didn't trigger properly. Try replaying 1-4 and 1-5 without skipping the cutscenes. (the demo version is getting pretty old and we've made several fixes since then so it's hard to remember it all. We should be pushing out a new version at the end of this month though)
it's the first time I hear about Window 84 bit? Idk, it might work, best to try the demo lol. As for the release date, it's going to take years, but new versions come out on patreon every few months.
Currently we're going through a major rework of the stages so it's been some time since the last version but there should only be about a month before we can release the next one. Given it reworks base aspects of the game, I will also update the itch demo.