I think the scarcity probably works better if you have more time to work with it. Thus it would make a lot more sense to give you more time on the later levels. As it is it's a challenge to be able to build up enough money quickly enough to be able to do interesting things with it later on in a level that's super scarce . One thing that didn't really come through here very clearly is that it's meant to have a fast and frenetic build phrase followed by a three times more important automated phase where the game runs with whatever layout you have. That's also probably the secret as to why the rotator is useful. As is I think the automated phase is actually super brief .