Start one-week hack, take nine days, and then release one chapter.
... Wait, I can explain!
When it came down to it, I realised that I had the choice of either releasing three rushed, low-quality chapters, or one polished, maybe-decent chapter. I opted for the latter.
And so it ends up that I achieved my goal about halfway: I couldn't hammer out the full product in a week, but I can hammer out a fairly polished chapter. Adding chapters after the first isn't nearly as much effort because most of the characters and game mechanics are already in place.
The download link is in the first post!
I do intend on seeing the project through to its full length of three chapters, but I needed the weight off of my shoulders for now. After this, there's one more project that never moved past half of a chapter that I want to finish as a one-chapter mod and release it, and then I'll be going back to work on my main project.
The story of the game is a means to the end of having gameplay, by the way. Try not to roll your eyes too much or they'll fall out of your head!