Thank you for a detailed review! We had in mind various concepts of how to expand the game, make new blocks, add bonuses etc. However, we considered focusing on polishing the very little what we had.
I still incubate ideas of additional content, the basis of the game encourages your imagination, provokes to think widely. But for a week gamejam it can be just fine.
I personally am fond of idea of Builtown being more of a deckbuilding roguelike with strict values and multiple ways to enforce your city. We'll see if that happens in the future