Today I made steady progress on a number of fronts.
I got the dialogue and interaction system complete enough to start writing the plot dialogue. Like Legend of Goblit, it's based on a DSL, but this one is quicker and dirtier because it doesn't feed into an extensive animation system. It's also less scripted, and based more on seeking out information and growing your knowledge. When you know more, you can ask more searching questions.
I've also started to clean up and adapt the initial artwork I drew on Sunday to tell the plot. There's a fair bit more to do, and the plot has some loose ends I need to work out how to tie up, but it all currently feels on track.