Cancelled
I have lots of scientific study and work to do, so my time is pretty limited. I've been thinking this engine was a bad idea three months in, but I wanted to finish it anyway. Almost a couple years later, it's become apparent that this project is dragging itself out. I'm not sure I'll even be finishing normal games either, this is the end of posting in-progress projects. Any further announcements of projects I'm working on will be after it has already been completed.
Bad Idea?
The idea of using any of the RPG-Maker series of engines, in retrospect, is a bad idea. They already exist as a suite to satisfy your curiosity and boredom. For the more ambitious game authors, I recommend you just pick up GameMaker, Acknex, or any of the other higher quality toolkits out there for lower prices or free. People claiming to be from the Terraria staff are planning an independent RPG Maker, you should be supporting those projects. Regardless of what you use, it always takes great effort to make a fun game- there are many better engines (in all use cases) than this one to make your game with. Hence, I've been trying to finish something I feel was a mistake for about a year now.
Hell, if I didn't already have a job, I'd ask the "Producer of Terraria" if they could use me in making an independent RPG Maker- something like that I feel is the true solution. Do it right from the ground up and discard the nonsensical Enterbrain designs altogether.
What Now?
RPG Maker 20XX is missing the cookie cutter battle system. It can be used to make games, but the optimal use will happen when the source code is modified to fit whatever game is being made. Yes, this is identical to editing the ruby scripts of XP/VX to match your game. This requires a few coders to make different flavors of 20XX and the rest of the consumers to make various games. It's not pretty, but I have to point out that I left behind some pretty usable materials.
I will leave Feld here to manage any newcomers to produce the different flavors of 20XX, and I will add anyone working with the code to the project staff. I will continue to respond to questions and comments via E-Mail, if you use anything other than E-Mail, your message will go unanswered. I recommend you e-mail me especially if you want to work with the code since the code is heavily commented but also very messy.
Conclusion
20XX was just a curiosity of mine, and I thought I might be able to help the community. There's only so much I can do, and I am sure I will no longer be capable of providing adequate support for 20XX by myself, and therefore it will not be enough to serve you well. I may release games in the future, but you will only see them here when they are finished. That means they're probably not going to be RPGs (I have finished games a long time ago, but they weren't RPGs).
Other programmers are welcome to take the source code (everything available from the SVN) and branch off in an attempt to adapt or modify the engine.