At long last, the final level has been completed. Most of the development was fairly fast as this part of the game is a mashup of all previous mechanics. The final exam, the test of what you have learned, the ultimate showdown of ultimate destiny.
The final boss, on the other hand, was quite challenge. All I can say without going into spoiler territory is that it's completely different from all the bosses that came before, and it pushed the game's systems to the limit. There's also a secret boss that can be found with some exploration and effort.
All that remains is testing, so a release date of 08/05/2026 seems like a reasonable time margin to ensure there are no major fuck-ups. So far only one tester has fully played it and feedback was quite positive despite running on a few bugs (which have already been fixed).
I've also been trying to get in contact with translators to localize the game into French and Japanese. The former seems like it could get done before the release date, but the later is an unknown at the moment.