One subjective issue that might be worth thinking about is how to visually represent the maths a bit more clearly. To give an example: I had tended to avoid levelling up the tickrate of the white cubes because it felt like I was limiting the number of high-value cubes that could occupy high-value positions. The same goes for the cube size upgrades. Of course, if you sit down with a stopwatch you eventually realise that you earn more money by filling the containers rapidly with white cubes than slowly with lots of a high-value cubes, but I don't think this is intuitive!