Thanks a lot for the comment!
Yeah, that is the case, we thought up a concept that required quite a sizeable amount of work (with the procedural letters and all that), and it seems it turned out fun but we haven't had any time left to add a proper progression and goal to it.
We have more ideas for the money system like different publishers liking different features, getting paid per milestone, and some others, but we didn't have time left to implement them. Even the Boost buttons are obviously a last-minute addition to provide some way to spend money. :D
So right now having more money just makes it easier to try out more feature combinations.