Huh, that actually makes sense. Well now I feel stupid.
I was prepared to insult your mother and write a long rant about what I thought was actually going on behind the scenes, but yeah, that's right.
Sandy pussy aside, I do have an interesting theory that assumes Kikiyama is or was actively developing the game. My assumption? He continued on with trying to get the game to 1.00 until about 2010, then decided to switch engines to make some of the things he had in mind, since 2k3 can only do so much. Shit happened, and four learning curves later the project just slowly died or sank into development hell because he's a lone developer who probably wouldn't work well with anyone else, thus the port job had to be canned.
Theory 2: he was working on the game, but lost all his progress. Basically any digital notes, WIP assets, or even the entire project got borked and he had to then rely on the version he released. Disheartened, Kikiyama silently canned the project.
Theory 3: Same as theory 1, except the port job happened later and he's currently in the process of making what's basically an entirely new game with the same feel.
Theory 4: Less exciting. Whatever everyone else on Ubuu is thinking (work and life called, and the game had to be quietly canned)